
To view available Wi-Fi networks, click Show Networks, then choose a wireless network from the list.
MESH ROUTER FOR MAC PASSWORD
For example, you can specify preferred Wi-Fi networks and arrange them in order of preference, and specify whether an administrator password is required to control certain Wi-Fi capabilities, such as turning Wi-Fi on or off. You can set advanced Wi-Fi-specific options. Maybe you can find an orientation which can solve your problem. Most antennas radiate the signal outward (and sometimes upward/downward). Sometimes being too close to a router's antenna can give you a weak signal if you are in the signal's dead zone. The signal does tend to leave in a certain direction so maybe the dead spot can be oriented toward the troubled location (or the local access point's antenna better oriented to provide a stronger signal in the direction of your Mac, or both). You can try reorienting the router's antennas.

Even in my area with single family homes I can see multiple WiFi routers. If multiple neighbors deploy such a system, then everyone's strong signals can wreak havoc especially in town homes and apartments. But not being able to adjust the strength of the WiFi signal is a poor design of the Google Mesh system. Our networking people never found a better way yet than to adjust the signal strength of the access points. I do know macOS doesn't like to give up a connection even if there is a stronger one available. Maybe MacOS is not designed to work well w mesh networks? So you believe this to be an issue w the WiFi unit and not MacOS not giving up a weak signal? I'm more of the opinion that it's a systematic flaw w MacOS if it persistently hangs on to an inferior signal over a stronger one (your exp and mine).
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I'll update if this is really a permanent fix. So far the MBP is still holding stable to the good unit. Since my MBP seems to love the 2nd floor unit so much, I decided to grant its wish. What I JUST tried was to physically swap the 2 Google WiFi units. The first time I connected to a 2nd floor access point amazed me, although it usually indicated that our local access point needed a reboot. It's not perfect, but we can deal with it. We were able to have our signal strength increased ever so slightly so that we could properly test the hardware.

TRaymondKM story seems to end in sadness (1st floor users having problems connecting to WiFi access points in 1st floor). Otherwise you may need to contact the vendor or look for other WiFi solutions which give you more configuration options. I know they will contain the same settings, but it may be enough to have macOS hook onto the stronger signal.
MESH ROUTER FOR MAC MAC
If you cannot adjust the signal strength of the other antennas or block their signal enough, then maybe configuring Network Locations may be a quicker way to try and force the Mac to search out the stronger signal (or you can try turning WiFi off and on, but I think the Network Locations will be faster). They had to lower the signal strength on our 1st floor so much that we started having problems connecting to the WiFi access point in our 1st floor area.

We had to significantly weaken the signals to prevent the issue (We have heavy duty concrete floors in our building as it was an old factory building, yet we could still see and connect to the access point on the other floor). We've had the same issue with Macs in our organization refusing to give up an extremely weak connection.
