I’m very new to this - scrounging around for something else, but what I just read seems to fit your question (again…very new…it may not). Just saw timeline and a recent post, and I get that crunch:)
Seems as though example 4 here may help: http://interactions.webflow.com/
Hi, go to my page and click the last menu on the right “Open Panel”. This is a simple way to do. And if you want it to stay fixed - and allow scrolling inside the block - just add “Overflow: Auto”.