I made a dark colorscheme like the one i use on delphi 10.3.3.
this is the path to paste it to:
C:\Users\yourusernamehere\AppData\Local\lazarus\userschemes
Or, more generally, for non-Windows platforms running the IDE, create a userschemes subdirectory of the Lazarus primary config directory (if it does not exist), and place the .xml file in /userschemes.
View | IDE Internals | About IDE
lists various paths including the Primary config directory, if you are not sure where it is located.
Thank you
wullie for your contribution.