Our sandbox (with a permanent vote score of 124) is perpetually hogging attention near or at the top of our Meta homepage.
In contrast, Physics StackExchange's sandbox's activities rightly occur under the hood, because editing that sandbox does not bump it, thanks to its -17 vote score, due to this prominent notice at its top:
NB: It's hard not to like this meta post but please keep it downvoted to -8 or less (rather than upvoting it) so that it doesn't get bumped to the front meta page every time someone is experimenting in the sandbox, which usually is not interesting to anyone else.
Let's emulate PSE's sensible setup: close our current sandbox, then create a new one with a similar directive that it be kept heavily downvoted.
As usual: upvote for aye, downvote for nay.
EDIT to highlight pertinent comments:
isn't it a good thing for the sandbox to be visible/prominent for those who might not otherwise know about it, or might forget about it?
MartinSleziak’s suggested workaround (may be more aggressive than desired):
Profile$\to$Settings$\to$Tag watching & ignoring$\to$Sandbox