Extension Menus do have a Down-Arrow by default. I guess this is a relict from the past when EasyEDA and also Extensions just had Icons in the main menu.
The Down-Arrow should be removed, it makes no sense...
![2021-03-19 22_44_51-EasyEDA(Standard) - A Simple and Powerful Electronic Circuit Design Tool.png](//image.easyeda.com/pullimage/GtQ1WZlg1frIKIQF9FzdhKRPhMvCgybGJiDw2ikb.png)
Maybe also seperate Extension Menus with a vertical divider from the regular Menu items.
Chrome
89.0.4389.90
Windows
10
EasyEDA
6.4.17