You “can’t find a way” in Brave Browser to maintain the order in appearance - from left to right - of the Brave Browser icons [they are not “tabs”] in the Windows OS Taskbar, if/when you restart Brave Browser.
I replied with guidance about the Windows Taskbar, plus information about, how to be prepared for, when things go wrong - while you explore and might engage in Trial and Error.
Because, I want you to succeed in your quest.
I often try to encourage Internet browser users to back up their data, to be prepared.