Resignation during the unpaid leave period due to COVID-19

I am a manager in a UAE company, I have served 2 years on an unlimited contract. I have been instructed I am on unpaid leave for a 3-month period in light of the current situation.

The company is asking me to sign an annexe to my contract that I accept this unpaid leave period. If I do accept, can I still resign during this 3-month unpaid leave period if I get another job?