Hello Hossein,
Access rights in the device tree are controlled by group memberships. When you create a new user group, by default this group has no access to anything in PRTG.
As many other settings as well, access rights are inherited from top to bottom, you can find them on each object's "Settings" tab. If you want to grant access rights for a user group that should be effective for everything in the device tree, you do so in "Settings" tab at root level, so basically you click on "Devices" in the menu, now you're in root view, head to "Settings" and scroll down to "Access Rights" where you can set access rights for each user group that will be inherited from there to all objects below.
In case you want to grant access only to particular device group, head to "Settings" tab of the respective device group and set access rights as needed.
See also User Access Rights (PRTG Manual)
In case the user should only be able to see a particular map, create this user as just mentioned in PRTG, but you don't have to hand out the credentials. Instead hand out the HTML link from the map's "Get HTML" tab and add the following to the map's link:
&username=prtg_useraccount&passhash=passhash_from_useraccount
You find the passhash when opening the user account in "Setup | System Adminstration | User Account", this can be used to view the map then as well.
Kind regards,
Erhard
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