[LINUX_Newbies] fixed mouse

good morning
this happened sometimes
every 3 months one time only
but I want to learn Linux.

I click
10 windows open
and then the mouse is connected to a small window like Chromium
whatever I do
the window is connected to the mouse.
I can do nothing.
Moving the mouse
the window is following.
left click
nothing
right click
nothing
esc nothing

I do shutdown.

Is there a way I can disconnect mouse and this window?

Regards
Sophie




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