How to improve wifi reception? - Samsung Galaxy S9+ Questions & Answers

The 5ghz wifi signal reception is very poor - only 1 bar (out of 4) behind 1 wall, 1 meter away from router. The laptop next to the phone has 3 bars wifi reception. Is there a setting on Android (or Magisk module) to improve wifi reception? The only option I saw was wifi throttling in Developer options but it doesn't change anything.

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It sounds like there is some material in the wall that is blocking the signal. It could be metal or metal containing construction material. That's not uncommon in concrete buildings or outside walls in houses. It's also possible there is some interference on the channel being used. Some options are: change the 5GHz channel on the router, switch to the 2.4MHz band, move the router (though that might cause the inverse situation) or put an access point in the next room. For best results, the access point should be wired if possible.

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As mentioned, location, location, location.
Even a few feet in any direction can make a big difference. Avoid close proximity to large earth grounded objects.
Make sure the router has the lastest firmware update.
Try a network reset on your phone as well.

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Thank you for your suggestions. Everything is duly noted and done physically (e.g. router location, antennas, phone without case, etc.). The only thing I need is advice of a software setting to improve wifi reception of the phone. The thing that makes me think that there is something that can be done is the 3/4 bars signal reception of my laptop as compared to the 1/4 bars of the phone.

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There is probably nothing that can be done on the phone. Bars mean nothing in absolute terms. Depending on the phone and software maker, it can mean different things. Wifi is measured in milliwatts or dBm. A software wifi analyzer will usually show signal strengths in dBm. Even that can be misleading because it can depend on the hardware and software. For example, the laptop probably has larger antennas that receive a stronger signal than the phone.
What really matters is the speed of the wifi connection. Using readily available speed test software will determine the real speed of the internet connection to the device. As long as the device gets enough wifi throughput to operate well, that's all that is required.

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Thank you. The 5ghz throughput is excellent, even on poor connection, but the problem is that the poor connection frequently drops and the phone does not automatically reconnect because of the poor connection. So, throughput is not a problem, poor connection is.

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This may be due to a router feature called band steering or router support for mesh. They may go under other names like smart connect. What they often do is disconnect devices with a poor signal. That's fine if another usable signal is available but can result in a lost connection otherwise.
Another issue may be that auto-reconnect on the phone is disabled. It's usually enabled by default but can be changed under the advanced wifi settings for the wifi connection.