Greetings to all...

I would appreciate if you can give me suggestions how to perform the following configuration with Mikrotik.

I have 4 ports for my LAN on a 192.168.1.X / 24 subnet, each port is connected to an access point. What I need is that they are isolated one port from the other to go to the internet (to WAN), but without losing access to their administration, that is; that from an IP address 192.168.1.X can access another IP address 192.168.1.Y regardless of the port to which it is connected

Example:

Ether2: 192.168.1.1, 192.168.1.3, 192.168.1.5, ...
Ether3: 192.168.1.2, 192.168.1.7, 192.168.1.8, ...
Ether4: 192.168.1.4, 192.168.1.9, ...
Ether5: 192.168.1.6, 192.168.1.10, ...

The idea is to reduce the collision domain to each port (each access point)

I have been able to do it by creating a Bridge on all four ports but the collision domain would be the entire subnet, or am I wrong?

I hope you have explained me well. Regards!

I think that there are two different domains being confused here; if want to split your collision domain, then just add all of your interfaces in a single bridge (collision domain is related to layer2 networks, where in the old times there was a HUB in the middle, so the collision domain was shared through the entire device, in the actual life there is a different collision domain per switch port); if you want to do that, then you'll need to split the broadcast domain by using different subnets at each interface or maybe using VLANs too.