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Flameshot, an Open Source screenshot software
(lemmy.sdf.org)
Features:
- Highly customizable
- In-app screenshot editing
- Upload to online platforms
- Command-line interface (CLI)
Platforms:
- Linux
- Windows
- MacOS
Link: flameshot.org.
For me it captures all the screens and let's me pick the region, even when crossing over two screens.
Which OS are you using? And if Linux, are you running Wayland or X?
I'm on Linux, with Wayland
You might need some workarounds for it to work. I'm using Sway as my window manager, where the missing piece war the "for_window" bit on this page.
https://github.com/flameshot-org/flameshot/blob/master/docs/Sway%20and%20wlroots%20support.md
Depending on your desktop environment/window manager, you might need some different workarounds.