joomla protect administration area

Hello, I have joomla_nicepage_plugin 2.8.2. with joomla 3.9.16 running. I have protected the joomla administration directory with htaccess provided by the webspace provider.

Desired behaivor:
- If I type www.domainname.com I get the website.
- If I type www.domainame.com/adminstration/ I get a popup with a additional password request.

Current Situation:
I type the domain name like www.domainname.com (with no subdirectory) and I get a pop up with the protection from the administration.

This is because the component "Nicepage" from the startpage loads stuff from administration area:
http://domainname.com/administrator/components/com_nicepage/assets/

e.g.
http://domainname.com/administrator/components/com_nicepage/assets/js/nicepage.js
http://domainname.com/administrator/components/com_nicepage/assets/css/media.css
http://domainname.com/administrator/components/com_nicepage/assets/css/nicepage.css

Question:
Is there a way to tell nicepage not to do it or load it from somewhere else?

Thx,
Marko