Who is an administrator
Administrator is a super user who has access to all options on the portal. The administrator must have sufficient qualifications and knowledge to be responsible for the entire portal work.
Despite all the power, the administrator cannot read conversations in private chats, including group chats.
How to assign an administrator
The user who registered a Bitrix24 portal is the main administrator. It is possible to take admin rights from the portal owner or fire him/her, but you cannot remove the admin completely.
To add one more admin, go to the employee's profile and select the Assign admin permissions option in the Action menu.

If you want to change the first administrator, read the instruction in the article.
How many administrators can be assigned
There is a limit on the number of users with administrator rights, depending on the plan. These limits are applied only to the portals created later than 08.08.2017.
How to reassign administrators
If you want to change the list of administrators without upgrading the plan, you will have to take the rights from the current administrator and assign them to the new one. At the maximum plan, you can assign as many administrators as you like.
What happens the plan changing
If you upgrade your portal to a higher plan, you can assign new administrators in the usual way.
If you decide, for some reason, to switch to a lower plan with fewer administrators, then only those administrators who were last authorized in your Bitrix24 will have the rights. When you decide to go back to the previous plan, the administrators will have to be reassigned.
Where can I find a list of administrators
A list of all administrators can be found by the filter.
If there is no Administrator field in the filter, add it manually using the Add Field section.
Administrator mode
Bitrix24 administrator can see and manage all groups and projects in the company. To do this, you need to activate Admin Mode on your page.
The ability to activate and deactivate the admin mode is designed for your convenience so that you can work calmly without being distracted by the flow of information coming from different sources.