How to merge branches (without console) if it doesn't work?

Question

git

There is a default main branch, a wpf branch also created separately, I only worked in the wpf branch, then manually transferred all the files to the main branch, added changes and commits to the wpf branch and wanted to freeze the wpf branch to the main branch, but on github when creating Pull request and select branches says "There isn't anything to compare. main and wpf are entirely different commit histories."
How to solve this problem? I already tried to use the git bash console, but I don’t know how to work through it, something flew there, and through visual studio c# the main branch is not shown there
link to the git repository - https://github.com/Daizygod/fast_build

Answer 1

Created a new branch from main, and now I can merge