I posted about it in another thread, but just a quick example of what 6.0 fonts look like:
This is supposed to be one (random) single word: BELIBGUE and a number 208.0
This is with non aliased font at 14 pixels.
The kerning is very inconsistent and the conversion of the font is also inconsistent.
You can barely tell it is a single word, and the zero and eight digits are mostly indistinguishable.
On 5.3 it was perfect.
The font is Pixellari converted with the CLI using:
lv_font_conv --font ~/Downloads/Pixellari.ttf -r 0x20-0x7F --size 14 --format lvgl --bpp 1 -o ./pixellari_6_test_cli.c