@El-Greco-0 ,
The Ctrl+Tab / Ctrl+Shift+Tab is the “Document Switcher” feature. By default, Settings > Preferences > Misc > Document Switcher has ☑ Enable MRU behavior checkmarked, which turns on Most Recently Used (MRU) order for the Ctrl+Tab order. If that is unchecked, then the Ctrl+Tab order is determined by the order of the tabs in the view, so if you turn off that option and use Window > Sort By > Name A to Z, then Ctrl+Tab will follow alphabetical order.
The reason why Ctrl+Tab defaults to MRU, is because it is often (maybe even mostly) used as the quick/simple “swap between this tab and the last tab I used”, rather than cycling through the entire list. Also, there is a separate set of keystrokes, Ctrl+PageDown for next-tab and Ctrl+PageUp for previous-tab, which already follows the order of tabs in the view (so also affected by the Window > Sort By > … sorting), so it’s already easy to navigate between tabs in the view order by another similar means – so again, it makes sense to default the Document Switcher Ctrl+Tab to use Most Recently Used behavior…