Dev Option - problem. - Samsung Galaxy Note 9 Questions & Answers

Hi,
Samsung Galaxy Note 9
Android 10
I have a problem with developer options. I wanted to change the codec to aptx. I go into these developer options, change the options, and when I leave them, I have them set to sbc again. So my choices are not saved.
what to do?

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Add WiFi Frequency option?

On my N7 when you go into the the advanced wifi settings there is an option to select which wifi band you want to connect too, 2.4ghz/5ghz, appartly this was removed by samsung with the 4.3 release from what some S3 threads are saying. Anyway to add this to the Note 3?
example -> http://forum.xda-developers.com/showthread.php?t=1801993
jebise101 said:
On my N7 when you go into the the advanced wifi settings there is an option to select which wifi band you want to connect too, 2.4ghz/5ghz, appartly this was removed by samsung with the 4.3 release from what some S3 threads are saying. Anyway to add this to the Note 3?
example -> http://forum.xda-developers.com/showthread.php?t=1801993
Click to expand...
Click to collapse
I don't know of any way to restore this feature to the note 3 rom. But if your willing to install a third party app you could try Wifi Analyzer https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer also install Wifi Connector Library https://play.google.com/store/apps/details?id=com.farproc.wifi.connecter
It shows you much more information than the stock Wifi utility on the note 2, 3 etc. Including mac address, channel, 5G, 2G etc. I would post a screenshot but that would show my mac address along with those of my neighbors, not a good idea.
I have that but its not as convenient.

[Fixed] System freeze after playing with "secondary monitor" in Developer options

[Fixed] System freeze after playing with "secondary monitor" in Developer options
Hey, I just played around in the developer options and wanted to find out what "second monitor" does.
As far as I remember I set it to 480p and the system froze immdediately.
Rebooting the device shows the bootloader but the animation will stop soon.
I am using LineageOS 14.1 on my Sam S3 mini.
I was able to connect via adb - may be I can fix the problem by myself if someone can tell me where these settings are stored.
Some research here and with google gave no useful results so I just asked here.
--- Edit:
I was able to fix the problem in file /data/system/users/0/settings_global.xml which is not were I expected it to be (Google told me different).

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Platformver: k20N_2018/10/22
And I would like to enable multiwindow support, but I cant find any options for it even in the dev op screen
It seems as if the manufacturer has cut a lot of features or is installing a lower version of android and calling it 8.0. Any ideas

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Hi all. I'm thinking to buy a MI9 but only in case I could find a way to setup multiple users on the device. I understand the MIUI doesn't have this feature by default which has been keeping me away from this manufacturer for a long time. However, I still hope there should be a way to enable the multiuser mode? Anyone?
you're wrong. MIUI has user accounts. just go to settings, special functions and profiles
Not only that, apart from user accounts, you can clone applications on one account that you won't find on other smartphones
You have second space in MIUI 11, but it's only 1 user more

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I have looked through all the settings but didn't find anyway even in developer mode.
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Thanks in advance for your help.

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