Dear administrator, thank you for your response. I recorded a short video, literally 30 seconds, where my brush does not work. Here is the link. It is safe - video on the Mega service.
https://mega.nz/file/lylWFBaL#0JwXL4t8d ... v-5plEQ5go
I hope you will help me figure it out.

Hello. I started to explore your program and encountered several difficulties at the entry point. I do not want to create separate topics; maybe I can describe some points here. When clicking Edit, the brush activates drawing mode, but when selecting a node and enabling the “brush” button, the brush...