Suggestion: Changing Multiple Tasks

I’ve got these 3 tasks here. and I need to set them all to 100%. I can’t find any way to do that right now. I would appreciate adding this feature to the program.

I can only modify one cell at a time, but perhaps making the program edit them all after I select them and modify one would be better.

Relevant existing issue in the issue tracker: Properties mass edition for multiple tasks at the same time. · Issue #186 · bardsoftware/ganttproject · GitHub

So this suggestion was reported 7 years ago and is still unavailable?

Apparently users can live with that.