Back button - to go back to last visited world (and instance)
Plaster
It's not rare where I go through a portal but want to go back from where I came from afterwards without having to check my history and then figure out what instance I was last in.
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ZidaneTOrnitier
Currently VRCX has a setting that does this for when you crash, but having a native option, even if it's just a modification of the "You Are Here" tag to say "Last Visited," assuming the instance still exists, would help. Especially when you want to avoid going back whence you came due to too many trolls or something.
Wing
This will also be helpful when the game crashed and you wanted to go back to the last visited instance.