Board Thread:Support Requests - Designing Your Wiki/@comment-36971458-20200603162340/@comment-9605025-20200603173232

Are you asking for a way for users to adjust the size when the post it or just for a way to make them all larger? If the former, I don't think so. At least, there is no pre-built method. However, some of the features in ChatHacks suggest that it might be possible with a custom script. If you meant the latter, then yes; using site CSS.