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Please, a single feature per issue.
I use it to composite different snapshot of different places/status of an app. Do a screenshot, pin it, move it, do another one, etc...

you can close the pinned screenshots with Escape or double click, drag it with the mouse and resize the widget with the mouse wheel.
I have to write an user manual so people can read about all the functionality of this software.
Ah! I did not know the resize thing! Nice :-)
There is no pin-tool button here. I'm using the git version under Mint 18.3 (ubuntu 16.04) and compile flameshot from master branch.

It's not enabled by default, have you enabled it in the settings dialogs?
Ah, I feel really stupid. Thanks for the hint!
This tool is quite useful! I guess it could be enabled by default?
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This tool is quite useful! I guess it could be enabled by default?