The possibility to resign and find another job without leaving the country

Dear sir/madam,

I am a British National who has spent 90 days on a Tourist Visa (30 days extended) in Abu Dhabi. At the end of my 90 days, I was offered a working position and began at a new place of employment. I now have a working visa and Emirates ID.

However, I am finding the workplace challenging and wonder if I decided to terminate my work contract (within employer guidelines and within probation periods) - what does this mean for me and my residency here?

Do I have to leave the country and return again on a Tourist Visa? Do I have a grace period to find alternative work? Are there any financial penalties?

I'd be grateful for some advice!