Agreeing with Phillip Corcoran.
You may be mis-intrepreting the administrative page in the screen shot. "Enable Remote Management" access as I understand the image does not mean wireless per se. The screen allows you to establish one IP but does not distinguish between wired and wireless.
To access a router's admin pages you only need its IP, login ID, and password.
Router does not care about the physics (wired or wireless) of the network connection being made.
About the only way to keep someone else out would be to assign all of your devices (wired and wireless) a reserved (by MAC) static IP and disallow any DHCP IP assignments. Very cumbersome to establish and manage. Some "whitelist".
However, IPs and MAC's can be spoofed. And if the router is physically reset all your work will be lost.
Use a secure password as suggested.