The question says it all, how would I force MouseLock upon the player, or at least simulate it?
To avoid confusion, I'll make it clear that I want to force the option that EnableMouseLockOption in StarterPlayer enables.
For example, if you go in ROBLOX Client Settings, you'll see Enable Shift Lock Switch, I want to force that.
And please, no GUIs.

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I know, sorry for making it seem like that. But I was actually stumped, as I browsed the internet for it and it said it would not work, and I do not have experience with camera manipulation, yet. Once again, thank you for helping.
Welcome, very simple so no problem on helping you.
Wait, oops. I was actually meaning the camera mode that EnableMouseLockOption enabled, sorry for false alarm. :\ I would upvote you still, however do not have enough reputation to do that.
Oh, easy. Not scripting though
No, no, I meant like, forcing it. Not just leaving it open for an option.
I already told you how to make them be forced in first person with my other script..
For example, if you go in ROBLOX Client Settings, you'll see Enable Shift Lock Switch, I want to force that.
Okay wait I am opening up studio
ROBLOX Client, not studio.
I KNOW. Now I do not think ou can force mouse lock.
You can, at least simulate it. I've seen it in games. But don't know how to do it.
But you'd probably have to work with GUIs which I do not.