Undo and Redo button not activated

Support
1

I’m using mn3 with ipad pro 12.9 3rd.

When I used study mode before, undo and redo button was activated and worked well.

Nowadays, howevere, these buttons are not activated, so I cannot use MN3 study mode mind map conviniently.

Is it bug? Does anyone know how to fix this situation?

2

Hello

May I trouble you to record a video?

Kind Regards,

Support Team

3

Hello

Try restarting the app～

Kind Regards,

Support Team

4

5

It is very slow when card deleted, and undo and redo button are not activated as you can see

6

I know restarting the app can fix the problem, and I do whenever it occurs. I want to make this problem not to happen anymore, and notice to the support team.