Click on the Gears icon and select General Preferences under Basic Settings. This allows you to fully customize your property on Switch.
You can choose your time zone and you can toggle on/off some of the features Switch offers.
'Require guest to email booking reservation' should always be 'ON' if you want to receive the guest's email when the they book from OTAs or the Booking Button. If you don't have their email when they make a direct booking (in person, telephone, etc) you can put a simple fake email such as "email@example.com"
'Hide/Show Check-in Check-out columns Table' you can choose what information to show in the Check-In/Check-out tab by clicking these items on/off. See below: