I am new to QGIS, and using version 3.10
I have about 36 vector layers so far. With more than about 5 layers open, it is difficult to identify what the round green dot means. I am thinking that there may be better symbols. As far as I can tell, I am supposed to click settings | style manager | import/export, click import and point to an XML file. I have googled for XML symbol files and I am not finding any.
The information in Is there a SVG symbol library for QGIS? is out of date.
What am I missing?