How to navigate between different tab groups with keyboard or menu?

I like to use a vertical split to have the source file I'm working on in one vertical pane and the test file adjacent. In Rider I select Window | Editor Tabs | Split Vertically to get going. I've been struggling to figure out the best way to navigate back and forth between the test file and the implementation file I'm testing without using the mouse. Is there a keyboard shortcut for this navigation? The best I've come up with is using the ctrl-tab to get the short list of most recent files and switching that way. I imagine there's a way to set a bookmark and navigate between different bookmarks too? I know Visual Studio Code has keyboard support to navigate between left and right tab groups like this and Visual Studio can navigate "forward" and "backward" between two tabs that are vertically split like this. Suggestions?