Remove OpenVPN completely!! hue hue
No, seriously, there’s absolutely NO reason to use OpenVPN on a MikroTik.
There’s no space on 16MB devices to use the fully featured official OpenVPN implementation.
And to add more features to the implementation done by MikroTik ain’t worth the devs time.
Use it as it is if you have a usecase for it, if not, use another VPN solution that has more features and is better supported.