There are many file explorer replacements for Windows. My personal favourite is Q-Dir. It does everything standard explorer does, and a few more features. Q-Dir is my favourite because it supports many view layouts, my personal favourite is quad mode. It is easier than having to open up 4 standard explorers and switching between them. There are other alternatives like FreeCommander and whatnot, but I’ll let others take the credit for them.
The still white parts are system themes, and a custom themer is required to change them. I left it on the default theme so you can mix and match custom themes on your own.