Board Thread:Support Requests - Designing Your Wiki/@comment-33688175-20200317170752/@comment-9605025-20200518000121

To hide unused fields in a non-portable infobox (what you currently have), you do something like this. Portable infoboxes use a Fandom-custom tag system. Fandom's custom extension then takes the information provided by these tags and formats the infobox differently depending on the type of device. This allows editors to write just one simple piece of wikitext while also allowing users to view a version of the infobox that has a "pleasant" appearance on whichever device they are using. If you go to the template page, you will notice a "Migrate this infobox" box in the right rail. Click that button to generate a autogenerated draft of the portable infobox. You can always edit the draft before finalizing the migration. You can read more about portable infobxes as Help:Infoboxes. As for the width, your current template is 260px wide. Portable infoboxes are 300px wide by default; so pretty close. If that isn't close enough for you, you can always change the width of portable infoboxes via site CSS.