My Panther instance is configured to use my own Snowflake account as a back-end, rather than one managed by Panther. Am I free to change the size of the PANTHER_WH warehouse, or will it interfere with Panther functioning?
As the account owner, you are free to change the warehouse size as you see fit! Note that upsizing the warehouse will increase Panther performance, but increase your own Snowflake costs.