Safe browsing via OpenVPN

Hi everyone,
I set up OpenVpn on my Mikrotik device, I used their DDNS service too since I have no static public IP. Everything works great so far; I also can get access to my LAN with my smartphone via OpenVPN. However, I noticed that I can’t browse the Internet with my smartphone when my OpenVPN client is connected to OpenVPN server on my Mikrotik router. I’d like both to get access to my LAN and, if I need it, to browse the internet taking advantage of the VPN connection too, so gaining also a safe browsing this way.
What should I do?
Thanks

I finally found out what kept my smartphone from browsing the internet as it was connected to my Openvpn server on my LAN.
I had to disable this rule:

add action=drop chain=input comment="defconf: drop all not coming from LAN" in-interface-list=!LAN

But why? I could get access to anything (like my LAN sharing resourse, to OMV’s dockers and so on, even to my mikrotik router via the winbox app on my cell) but the internet?
I would expect a “forward” or a NAT rule to be more likely the cause of my problem not a firewall input rule?
Could someone please help to figure this out?
Thanks