Can I change my visit visa to employment visa without leaving the UAE?

Yes.

As per the new laws, you need to leave the UAE first.

Dear,

Yes, it is possible. If you have found a job, then your employer will apply for your residence visa as your sponsor and complete the process.

You will be required to get the medical tests done and the security check for approval.

Your employer will or may apply for your visa status change whilst your visit visa is still active and/or during the grace period.

It is important it is done before visa expiry so you do not get fined for overstaying.

Regards.