In 3.70~5 with no mods, through the remote consol, the classic UI selection will say it is in Classic UI, but it remains in the new UI. In V3.62, (and earlier), it would change interfaces immediately. Restarting remote consol will sometimes restart in Classic UI if the display says Classic UI in the New UI menu, but sometimes it requires a VRM dashboard page refresh for this display setting to work.
The only reason I saw this behavior was on the hope that you implemented the AC voltage/frequency display for L1 and L2 on the menu page of the Beta V3.70 (it is not in 3.5, 3.6, 3.62 either). Having this info available on the GX display would help meet ABYC 11.9.3.2.3 requirement/exception for a voltmeter in proximity to the panelboard if an inverter or inverter/charger are installed.
I would prefer it always be displayed (or an option to always display) on the overview and other displays (boat display would make a lot of sense!) but at least be able to access the data in the menu (like the classic UI and VRM dashboard or as GUImods does). It should also be displayed on the shorepower box.
edit: the classic UI changes to New UI immediately using the V3.70~5 remote console…just FYI to the bug squashers