How do I change the resolution nvidia-xrun uses?

I followed the instructions for xrun here, in this thread, and while it works, the scaling is all off.

Since I'm using an Nvidia MX150, I figured that there's no real point in messing with scaling and all - I'm not going to run games at 1080p anyways because I want good performance. Instead, I could run my tty2 (on which nvidia-xrun is ran) at 720p. The question is, how? xrandr -s 9 gets me to 720p, but NOT in nvidia-xrun (which doesn't surprise me, since one is driven by my UHD620, and the other by my MX150).

Maybe through nvidia settings?

In theory arandr (AUR) which is GUI for xrandr should be able to change resolution of Openbox session.

Also, one can create Openbox (if that is what you use for running nvidia-xrun) menu with xrandr settings:

    <menu id="res-menu" label="Resolution">
        <separator label="Resolution"/>
        <item label="1280x1024">
            <action name="Execute">
                <execute>
                    xrandr -s 1280x1024
                </execute>
            </action>
        </item>
        <item label="1024x768">
            <action name="Execute">
                <execute>
                    xrandr -s 1024x768
                </execute>
            </action>
        </item>
        <item label="800x600">
            <action name="Execute">
                <execute>
                    xrandr -s 800x600
                </execute>
            </action>
        </item>

but those have to be defined in xorg.conf but the popular ones should already be there.

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