When I revisit these settings, I find the “Show Bottom TabBar” toggle has been switched to the Off position. I must then turn it back on, whereupon the “Horizontal” radio button (default) appears selected.
Next morning, having left the PC on to resume testing, I merely clicked the Toggle to Off and then On, whereupon I noticed it remained set to “Vertical” but the TabBar came back as “Horizontal”, as so…
Launch WinApp 1.6.x (TabBar visible and Horizontal)
Test ► Menu > Settings > TabBar Settings > Vertical ► OK (click dash to dismiss Menu)
Test ► Menu > Edit Dash Mode. Menu > Settings > TabBar Settings > Horizontal ► OK (dismiss)
Test ► click “Eye” (no line) > Menu > Settings > TabBar Settings > Toggle Off/On ► Minor FAIL (TabBar displays Horizontal but “Vertical” radio button now selected) (dismiss)
Test ► Menu > Settings > TabBar Settings > click Vertical > Toggle Off/On ► Minor FAIL (same as #4)
Back out of TabBar Settings > click TabBar Settings > Note that “Horizontal” radio button now selected.
(dismiss back to Dash) > click Eye (no line) > Menu > Settings > TabBar Settings > click “Vertical” > Toggle Off/On ► Major FAIL (TabBar now missing from Dash).
Toggle Off/On (TabBar reappears, but in H mode while V shows selected) [repeatable]
While TabBar visible, click “Horizontal” > TabBar disappears from Dash.
Return to Dash. Menu > Settings > TabBar Settings > Note that Toggle appears in Off position.
Toggle to On. TabBar appears on Dash. Click other radio button (H if V; V if H). TabBar disappears. [repeatable!]
BONUS: Click alternately on “Horizontal” then “Vertical” and repeat. Bottom TabBar never returns. (dismiss)
CONCLUSIONS:
Does not appears to matter which Mode (Edit/View) test commences from.
Key to repeatability is leaving TabBar Settings once issue occurs.
The magic sauce is Step #13 (i.e. at least once backing out of Settings while Toggle set Off).
REPEATABLE SEQUENCE Launch WinApp Menu > Settings > TabBar Settings > Toggle to “Off” Back out to Dash. Menu > Settings > TabBar Settings > Toggle to “On” > click the currently de-selected “Label Direction”
NOTE: Please rename this setting “Icon Placement” (to avoid confusion with spreadsheet “Orientation” options).