if someone is stioll wondering. you can almost but not fully disable the outlines, by editing "GameUserSettings.ini"
In C:\users\{your_username}\Documents\My Games\Borderlands 3\Saved\Config\WindowsNoEditor\GameUserSettings.ini, change the EdgeDetectionTexelOffset setting from the default of -1.0000 to a value between 1.25 and 1.99 (I am using 1.99):
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In C:\users\{your_username}\Documents\My Games\Borderlands 3\Saved\Config\WindowsNoEditor\GameUserSettings.ini, change the EdgeDetectionTexelOffset setting from the default of -1.0000 to a value between 1.25 and 1.99 (I am using 1.99):