May need to split 2.4 and 5 ghz

I have a Linksys model VLP01. Currently I have two ssid’s showing as 2.4 and 5 ghz. Can connect to each fine

Also have Vivint and I am so frustrated with the doorbell and thermostat dropping. So I took to ChatGPT today

My Vivint hub is using the 5 and the (according to Vivint tech) doorbell and thermostat the 2.4. But when I look for them in the Linksys app I don’t see them listed.

ChatGPT says I need to split out the 5 and 2.4 bands into separate SSIDs. That way if the hub switches anything it won’t drop the doorbell and thermostat.

So far I understand. But I cannot see how to split these on the app and although ChatGPT told me to use myrouter.local it does not show up as a valid website. Ditto using IP.

It’s the weekend and Vivint support is not open so I HOPE someone here can direct me in how to split these into separate SSIDs so the Vivint hub can see them and I can assign 2.4 directly to each of the devices