My email moves off screen to the right and disappears

Depend on the email program.. outlook,thunderbird etc. Sometimes the mail disappears from the device but remains on the main server. If that is the case , open the mail on another device, looking in the answered and trash folder, and mark the ones as new you want to save. If they are not there then the email program you are using has permanently deleted it from the main server.

Swipe the divider to the edge of your display and it will remove that half of the screen.
If you happen to have an overlay you can move the overlay off screen and it will disappear.

Sounds like you need to do a hard reboot. From Google:
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Here's how to perform a hard reboot:
- Hold down the Power and Home buttons at the same time for close to 10 seconds.
- Ignore the Slide to Power Off bar across the top of the screen when it appears and just keep holding the two buttons until you see the iPad screen go black and then see the Apple logo on the screen as it restarts.
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Hope this helps!

if your using a mouse check synaptics settings bottom bar tabs I think may help

When you open an email you want to forward, you click the reply arrow either at the top left of the screen where the move to and trash bin usually are.

Or in gmail you will find it at the top of the email on the right next to the name if the person who sent you the email .

good luck

How to delete or move ALL emails at once in non-jail broken ipad or iphone
It took me weeks of research to figure out finally how to decode this yet another secretive secret of apple. There is a perfect way of deleting ALL emails at once without jailbreaking your iphone or ipad...and here it is:
>> Open Inbox >> Edit >> Mark All >> Mark As Read [Added May 21, 2014 by Adrian; this extra step makes the difference between success & failure for some.]
>> Open Inbox >> Edit >> Check/select the top message; it will highlight the move button.
>> Press and hold the move button and uncheck the message that you had checked earlier.
>> Lift all your fingers off from the ipad screen and leave it alone. Wait until all your messages pile up on the right hand portion of the screen (in ipad); iphone will give you the actual number of emails it has selected for the action. Now they are just waiting for your command to be moved ALL at once.
>> Choose trash to delete all of them or any other folder where u want to move them, like one piece. Remember this will replicate your action on the server so you will ACTUALLY move them or delete them on the server and not just the ipad.
Once you have moved all messages to the trash you can either leave them there for the scheduled cleaning or empty it right away by doing this: go to trash folder and touch Edit. The Delete All button shows up at the bottom of the screen. Hit it! You're done!
If you do not see the effects of your actions on the server make sure you have enabled your email accounts for such actions.
Tips:
1. Please give enough time (could take up to several minutes depending the number of emails to be moved) for the emails to be selected for the move. Your screen will become unresponsive while all emails are being packaged. Once emails are ready, in ipad, you will see them zoomed out on the right hand side of the screen, and in iphone you will see the message showing you the actual number of messages that have been selected.
2. Avoid purging very large number of emails, the mail app might freeze or crash. If your inbox has thousands of emails change your sync settings in mail settings to fill lesser number of emails in your inbox.
3. [Added Jul 20, 2014 by Adrian] Many people have reported needing to repeat the above procedure several times before it succeeds. (I too have found this to be necessary a few times on my iPhone but not on my iPad-go figure.) So my final tip is to repeat the procedure 3-4 times if the mail doesn't disappear the first time. In my experience, if your messages disappear momentarily and then reappear, repeating the procedure will eventually make them stay deleted for good.
4. [Added Sep 18, 2014 by Adrian] If you are using IOS 8, there is a setting that may reduce emails piling up on your device! Go to Settings -> Messages and select Keep Messages under the Message History header. You'll be able to choose to keep your messages for 30 Days, 1 Year, or Forever.

1. Press edit in your email inbox.
2. Select the first email by making the circle red next to the first email or any one email in your email box.
3. Put one finger on the move button on the bottom of the screen that has now become active since you selected one email.
4. Now with your finger still on the move button press the original email again that you had originally selected.
5. When you deselect that one email with your finger still on the move button it will, pause for a second and it will bring up a move screen.
6. It will ask you where you want to move the emails to.
7. You can simply click on the trash folder and it moves them all to the trash.
8. It will also show you how many emails you moved.

You probably locked the screen rotation,
to fix this:

1. Rotate iPad so the display is in the desired orientation.
2. Double-click the Home button to display recently used apps.
3. Flick from left to right along the bottom of the screen.
4. Tap the Screen Rotation Lock button on the bottom left of the screen.
5. The lock will disappear