Software error

[AMAL_]

After my last security update my device notification color will be changed to black

It's in convenient to me

Anyone help me to fix the error 

Ssamsung galaxy s21fe exynos model

[Zammi]

I don't see you are not using any themes, so some settings might be making this issue.

Go to settings, general management, reset and Reset all settings.

[laibah_59]

Please be careful of any background apps they might also do this

[Samsung_specialist]

Consider resetting all settings or attempting safe mode. If the issue persists, you can submit an error report for further investigation.

To submit an error report, please follow these steps:

Open the Samsung Members app.
Tap on Support and scroll down to select Error Reports.
Choose the relevant category.
Ensure that "Send System Log Data" is enabled to facilitate a quick resolution.
Describe your issue in detail.
Adjust the frequency according to your preference.
You will receive a response notification from Samsung shortly after. You'll Get a Response Notification Shortly From Samsung.
https://www.samsung.com/ae/support/mobile-devices/raising-an-error-report-via-samsung-members-app/