Step 1: Open the FTP/Cpanel
Step 2: Go to this path: "\admin\templates\adminx\" However, please note that in your specific case, you may have used a custom admin folder name such as "member," "panel," or "billing." And edit the file and make changes in the header.tpl file.
Note: Please take the backup before making any changes.
Step 3: Now go to the header.tpl file and remove this variable as mentioned below and put the contentarea class below.
Step 4: After all the changes it will look like this as in below screenshot.
After all the process save the file then upload it.
