sway + flameshot config

swayflameshotconfig

# Add the two non-commented lines to your sway config file (likely ~/.config/sway/config)

# The first one makes the darkened desktop overlay actually match the desktop and cover it fully
# The second allows the save dialog to appear

# Tested on 
# % sway --version
# sway version 1.12-dev-f4aba225 (Dec  5 2025, branch 'master')
# % flameshot --version
# Flameshot v13.3.0 ()
# Compiled with Qt 6.10.1
# with XDG envs
# XDG_SESSION_DESKTOP=sway:wlroots
# XDG_SESSION_TYPE=wayland
# XDG_CURRENT_DESKTOP=sway:wlroots
# The variable QT_QPA_PLATFORM is unset (I assume it defaults to "wayland", as that also works the same)

for_window [app_id="flameshot" title="flameshot"] floating enable, fullscreen disable, move absolute position 0 0
for_window [app_id="flameshot" title="Save screenshot"] floating enable

This works almost perfectly, but the side panel opens on the leftmost monitor but to the top of the highest monitor.
I have a 4k monitor in portrait on the right, so the side panel is almost unusable.

Almost, because the flameshot window is actually just a floating window, with mod + mouse drag you can move it.