Add option for left side stage

Help with Snap! Snap! Editor
3

Hi, welcome to the forum!

We've put some work into allowing extensions of Snap! to rearrange the user interface, making a different-from-ours but uniform UI for their users.

But we're less enthusiastic about per-user settings for Snap! itself:

https://forum.snap.berkeley.edu/t/half-the-people-want-this-half-want-that-why-dont-you-just-add-a-setting/8412