Tab switcher
Since version 1.82, CudaText has option "ui_tab_switcher_dialog", which activates modern tab switcher for Ctrl+Tab hotkey. This is dialog which allows to switch tab using visit history. For example: press Ctrl, Tab, Tab, Tab, release Ctrl: this goes 3 steps back in visit history. Visit history is updated on tabs activation (activated tab moves to the top of history).
Alternative way is plugin CudaExt. Plugin gives command "Choose tab to switch to". You need to assign hotkey Ctrl+Tab to this command (hotkey will be removed from CudaText command). Plugin's dialog is richer than CudaText's dialog - it allows to switch to Console/Output/Validate panels, it allows to cancel the operation.