Total Commander

like this

now I use 4k Monitor, sometime the TC show folder icon like this

https://imgur.com/a/eMqerHB

TC uses icons in tabs from:
1. defined via view modes (Configuration - Options - View modes)
2. folder icons defined via desktop.ini file inside the folder, if the folder has read only attribute
3. Drive icons

The two folder icons are superimposed. The big icon on the bottom layer is the current folder icon when the TC was last closed, and the top small icon is the current folder icon of the current TC process.

Very strange, the tab control can only show a single icon per tab. Maybe it first draws the old icon and then the new on top?
Do the icons change when you switch to that tab?

it happend when check the setup->folder icon->show icon on the tab, if unchecked it, the problem disapear

and the icon on the tab couldn't custom the size, when i use 4k monitor, the icon will be small

it happend when check the setup->folder icon->show icon on the tab, if unchecked it, the problem disapear

But then no icon is displayed at all, right?

if UNchecked the Option->display->font->Settup DPI, the icon would be correct