When you right click on the trash icon on the panel, there's no option to open the trash settings (Preferences -> Trash). Consider adding it.
I would say it also makes sense to add the Trash settings to the Trash icon when it is placed on the Folder View Desktop.
Created attachment 138454 [details]
Screenshot - Configure Trash
Right click on the trash icon on the panel will show Configure trash option. On-clicking it will take to Dolphin Preferences focusing on Trash settings. Is this what you asked for? Shall I submit a merge request.
A possibly relevant merge request was started @ https://invent.kde.org/system/dolphin/-/merge_requests/209
Git commit 6b64c7ff56e0025608d03f21e64f47431e23ef23 by Nate Graham, on behalf of Saravanan K.
Committed on 20/05/2021 at 16:04.
Pushed by ngraham into branch 'master'.
Add action to places panel context menu trash entry to open trash settings
M +12 -1 src/panels/places/placespanel.cpp
M +2 -2 src/settings/dolphinsettingsdialog.cpp
M +2 -0 src/settings/dolphinsettingsdialog.h