what shall i do in this setting

If you are using Windows 11, go to settings, then search default apps, then search ROBLOX. Click Choose a default app or Roblox. A popup will open. If you would like to use the UWP version, click on the Roblox with a background (it will be a color). If you would like to use the web version, click on the one without a background. ( i dont have the any options just one )