I'm not sure what you're planning to do with the tablet, but I wrote the below assuming you plan to display a Hubitat Dashboard on the tablet. How you configure the lock screen us up to you (and the OS), but Hubitat won't have anything to do with that. This is something many people do--the Dashboard is just a webpage that can be displayed in any browser or a "locked down" one like Fully Kiosk that some people use.
On Hubitat Dashboard, you can set it so that a PIN is required to change HSM status (or location mode--might be useful if you tie mode to HSM status via an automation) from a Dashboard tile. You can also PIN-protect the entire Dashboard. All three of these are separate options you can configure in the specific Hubitat Dashboard child app for that Dashboard (Apps > Hubitat Dashboard, then find your dashboard listed underneath; do not directly use "Dashboards" on the left, which will take you directly to the dashboard and not the app for configuration). You can see a screenshot of these options here: [Dashboard] Pin Protected Tiles/Dashboards
I think SharpTools.io has similar options, but I haven't used it in a while. If you're using a third-party solution (HousePanel? I'm not sure how many others there are), you'll have to see what they offer.
