1. LMT Settings 2. Go to 'Pie Colors' and tap it 3. In the text field below the 'click to add color' type in "3" (without quotes) 4. It will now be the grey color without borders.
Alternatively if you want your own colors without the boder you can follow this:
#ARGB - Pie overall color #ARGB - Selection color #ARGB - Pie Icons color #ARGB - Clock color #ARGB - Notifications color #ARGB - outline (border) color
(#ARGB is the color value like for example #ff356600.)
You need to put those #ARGB into one line, you need to follow the arrangement as above, so if you want to change the outline color, you have to change the color of everything else. If you only put one #ARGB into the text field trying to change the outline color, it will change the overall pie color. So let's say you change everything into this color #ff356600, the text field should look like this: