Google no longer supports guest mode on Chromecast, which enabled users to cast from their phone to a screen without a WiFi network.
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How to Use Chromecast without Wi-Fi
Supposedly you can turn off network notifications : r/Chromecast
How to Disable Chromecast on Android
Chromecast guest mode guide - All About Chromecast
Chromecast guest mode lets friends and family connect without your Wi-Fi password
Use any phone except our own to set up our own device (Chromecast) : r/googlehome
Google Chromecast: Google removing Chromecast Guest Mode Feature: What it means for users - Times of India
Google removes Chromecast Guest mode that didn't need Wi-Fi
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How to Set up Guest Mode on Android
Chromecast - 9to5Google
How to Use Your Chromecast Without Wi-Fi
Google Chromecast with Google TV - Streaming Entertainment in 4K HDR - Snow GA01919-US - The Home Depot
Guest Mode - 9to5Google
20 Chromecast tips and tricks - CNET