This is related to my posts of July 25, 2019 on the Collapsed Topic plugin page. At the request of Gareth, I'm posting an image, here.
Since upgrading to Moodle 3.6, we've noticed that the content overlaps with the Edit menu (in pink on our site). You can see this demonstrated in the top of this image (highlighted in yellow).
The bottom of this image shows the result of adding the following to the Raw SCSS for the Boost theme. Note that my CSS coding skills are rudimentary, at best.
body.format-topcoll.editing ul.ctopics .section .activity .contentwithoutlink, body.format-topcoll.editing ul.ctopics .section .activity .activityinstance {
display: inherit;
padding-right: 125px;
}
This looks similar to how it would with the regular topic format, except I decided to pad by 125px, instead of 200px, because I felt it looked better and wasted less space.