Is there a button in the standard mastadon client that allows to search for more 'instances' 'worlds' - like 'search term [this thing] - outside my current bub

Is there a button in the standard mastadon client that allows to search for more 'instances' 'worlds' - like 'search term [this thing] - outside my current bubbles (instances they are called?) (or nostr or matrix or other systems for that matter ) - I think adoption is multi faceted - reasons to get people to check it out - reasons to get people to keep using it.. and if people check it out but do not easily find things outside the current instance censor bubble they will see it like every other centralized system, just with less.. So the building network effects will pull back as people can not easily find more / expand.. this is an assumption, as I have not used the mast client and don't know if it is easy ux/ui to search for more outside the home base thing. I'd like to see a chart showing that for all the fediversy things. (how easy to search outside base 1 or whatever)