Hey Pratham,
This is a fundamental issue with the Windows Workflow Foundation runtime. Please see my post here: Allow to change values of variable/argument during debug run - #2 by Joseph_Iaquinto
Remember to search the forums in case your idea was already posted, so that the discussions can be kept in one place. The linked thread was just started yesterday.
ashokkarale
MD_Farhan1
Ajay_Mishra
postwick
Dheerendra_vishwakarma
Anil_G
chandreshsinh.jadeja
Gautham_Pattabiraman
vrdabberu
aravindbalineni123