CAPac Internet vs Local Network settings

RouterOS Beginner Basics
1

Hi everyone,
so, my network is set up like this: the internet comes through my ISP modem/router, and it connects to CSS326-24G-2S+RM switch on port1.
On other ports are computers, TV, NAS etc, and one single CAPac.

The modem/router servers also as a DHCP server, and its DHCP range is 192.168.0.20 - 192.168.0.254.
CAPac got 192.168.0.20.

One thing I don’t understand is what I configure in the “Internet” section, and what in the “Local Network” section. I see that “Intenet” section has 192.168.0.20 as the IP and when I enter that into browser, I can login into CAPac. But what is the Local Network IP address field? What should I enter there?
CAPac settings

2

You seam to have configured the Cap AC as a Router
If you only want to use it as an AP i would ,

Step 1 : Reset Cap AC Configuration (No Backup & No Default Conf.)
Step 2 : Set Admin Password
Step 3 : Create Bridge
Step 4 : Add all interface to bridge
Step 5 : Configure Wireless Interfaces as needed
Step 6 : Activate DHCP-Client on Bridge