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Thank you for your answer @schwarzgrau.
Indeed you cannot easily manage the interface in TVPaint but what you can do is to take 2 screens of the same resolution and stretch the window across them.
But unfortunately you cannot put the drawing space apart.

Hello earwin, I just sent you a private message. Can you read it please ?

Hello,
I wrote you in private message. Can you answer it please? Thanks.

Hello Atikan,

I just sent you the codes at your email address. Please check your junk mail box if you do not find them.

I remain at your disposal by email if you need anything else,
Best regards,

Nora, from TVPaint Team