Yes, you can change from RouterOS to SwitchOS. Rather than me retyping all the instructions, check out this page in the online docs - almost all the way to the bottom. Start at: Configuring SwOS using RouterOS and read all the way to the bottom of the page.
https://help.mikrotik.com/docs/pages/vi ... d=76415036
I would STRONGLY suggest that you make a backup in RouterOS prior to switching to SwitchOS, and conversely making a backup in SwitchOS before changing back to RouterOS.
As far as configuration, I have only made that change once on a CRS326 that is now running SwitchOS, but as I recall, after changing the device to SwitchOS, it is the default SwitchOS configuration. Any config changes will need to be made by you.