Hello,
When I choosing Dynamic IP, on WAN / Quick set menu - internet working fine.
If choosing Static WAN - with the same ip/mask/gw/dns entries - no internet.
Why?

Hi,

Without seeing the config, i can only guess that natting/masquerade rules is not present when you don't use the quickset function, can you ping outside your network in the mikrotik terminal if you don't do configure your router using quickset feature?

Dont use quickset, reset to default and start again.

Without DHCP client it is necessary to set the routes.