To make new invoices, I can not drag the tax bar. Is there any problem?

Hello, MAITHAM.

We haven't received any issues about the "Tax bar." However, I'm more than happy to look into our system again. What tax bar are you referring to? Are you trying to drag the tax column on the invoice creation screen? Or are you referring to the Tax menu in the left navigation panel? 

More details would definitely help. Looking forward to your reply soon.