The Di2 display shows L = low, T = top (for 2 chainrings).

With an 11spd and rear spacing wider than 130mm, it is not unusual to have the chain hit the big ring when using the granny with the outer 3 rear cogs. Chainline will vary depending on rear spacing, crankset spacing and chainstay length. We run a narrow double crankset with 142/12 thru axle (same cassette location as with a 135mm disc hub) with 48/30 chainrings and I also ignore the outer 3 rear cogs when in the granny. When properly adjusted for all usable gear combos, the FD may still rub slightly when in the granny-11t, but that is irrelevant as you should never ride in this gear anyway. Adjusted for all other gearing, the FD should not rub at all.