This applies to so many situations that I think it’s good contender for a general heuristic of Grappling / Jiu Jitsu.

Control their support leg

don’t let your support leg get controlled

RDLR top; key to deny them the next steps, and to set-up leg drags or knee-smashes

Leg locks; “90% of the defense comes from the other leg”, which is why Danaher recommends the Double Trouble.

Kimura Grip; I had a kimura grip from side/north-south, and my training partner holding to my gi pants was preventing me from upgrading to either a Kimura finish or an armbar transition.

this would require a #video to illustrate, but I’m convinced that I’ll find more examples as I try to focus on this general rule.

Here Jason Scully from the Grappler’s Guide on how to stop total leg control.
“a grip break is a grip take” / “don’t waste your offensive opportunities”