hello thank you for the good work, I'm not a Programmer, but I have suggestion for you,
1 - adding a right click menu for mouse ( change or cancel, property etc..)
2- adds a menu for dimension botton and make more options
3 - Adds preview option for text menu
In my opinion a lot of users who are discovering LibreCAD came from AutoCAD.
I think when these users comment the interface "is not user friendly " they are just disapointed to lose their reflexes from AutoCAD.
For basic commands (like right clicks) I expect that the behavior of LibreCAD looks like AutoCAD.