FCP X retain sync multiple video and audio tracks
I'm sure there is an answer online, but I can't seem to find it. I have two video tracks with audio and one audio track in the timeline. I have them synched up, and I don't want them to drift unless I do want to change something. What is the easiest way to glue them together? (I know I can do it with a compound clip, but with a later option to alter them) I'm attaching an image. The video tracks are really just for reference.
iMac (2017 – 2020)