Undo function + Tie cameras together?

Support Basics & Interface
1

Hi, I´m new here. I didn´t find a fitting answer using the search function, so…
1 Is there a way to undo the last change in Blender? If yes, how can I use it?
2 Is there a way to tie two cameras together so they will always stay in the same distance to each other if you move one of them? (This would be useful for rendering pictures in 3D)
I´m thankful for any kind of advice :slight_smile:

2

1 Is there a way to undo the last change in Blender? If yes, how can I use it?

Ctrl+Z = undo
Shift+Ctrl+Z = redo
F3 = shows history

3

Ctrl+alt+Z = Undo history

Parent your objects to a new object (empty) and they keep their distance when you move them by moving the empty.

4

Ah, nice. Thank you!
Now I got another little problem: The arrows i use to move my objects have vanished and I an only move objects by pressing the left ouse button now. How do I make them reappear?