Hello AL OLABI,
Welcome to Microsoft Community.
In fact, when there are multiple user accounts on the same computer, Appdata under each account will have independent permissions. But if your account has administrator privileges, you can change the folder permissions of the target Appdata to "Everyone" so that all of your accounts can access the folder. Below I will send you the method to change the permission.
- Open the Appdata folder of the username you want to access, and right-click the folder to go to Properties.
- Click the "Advanced" button on the security tab.
- Click "Change" marked by the red line in the figure
- In the new window, type "Everyone" at the red line mark, click "Check name", then click "OK".
- Finally, the changes should look like this.
If there is anything not clear, please do not hesitate to let me know.
Best Regards,
Manson - MSFT | Microsoft Community Support Specialist