Start with a reset
System->Reset configuration->No default configuration
Reboot
Create a Bridge
Bridge->Bridge->+->OK
/interface bridge
add fast-forward=no name=bridge1
Add all ports to that bridge.
Bridge->Port->+->Ethernet1/Bridge1
Bridge->Port->+->Ethernet2/Bridge1
Bridge->Port->+->Ethernet3/Bridge1
Bridge->Port->+->Ethernet4/Bridge1
Bridge->Port->+->Wan1/Bridge1
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=ether3
add bridge=bridge1 interface=ether4
add bridge=bridge1 interface=wlan1
If you like the switch to get an IP
IP->DHCP Client->+->Interface:Bridge1->OK
/ip dhcp-client
add dhcp-options=hostname,clientid disabled=no interface=bridge1
This is how it looks like.
Basic Switch.jpg
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