This is a small mod for Garden Galaxy that adds a keybind to toggle the tile lock.
It does what it sounds like... Press T.
This mod will require BepInEx to be installed, follow the instructions here: https://docs.bepinex.dev/articles/user_guide/installation/index.html
After that is done, just drop the latest plugin file into the BepInEx/plugins folder in the game's directory.
Enjoy. :)