The Z-Wave poller app corrects a polling issue with certain Z-Wave devices that do not display their state properly, but the issue only affects certain non Z-Wave Plus devices. Older GE dimmers and switches are well known to have this problem when activated manually. If your GE devices pairs as "Generic Z-Wave Dimmer" or "Generic Z-Wave Switch" it is a candidate for needing Z-Wave Poller. Z-Wave Poller only works with devices that pair with these two drivers. To verify that your Z-Wave device is a candidate for Z-Wave poller, active your device manually, and watch the logs to see if the device does NOT register a change of state in the logs. If it doesn't, then it is a candidate for Z-Wave Poller, but if does register a change in the logs, you should not use the Z-Wave Poller app with it.
From the sidebar of your hub, select Apps and then Add Built-In App.
Select Z-Wave Poller from the list of Hubitat Elevation Built-In Apps