I see what you mean. As with AyaNova 3, these are settings that are hard coded into the Schedule screen, they are not editable by the user.
AyaNova 4.0 displays in 30 minute increments whereas AyaNova 3.6 displayed in 15 minute increments. I will have development look into this.
AyaNova 3.6 had 8 to 5 highlighted in a slightly lighter color than the rest of the hours, whereas AyaNova 4.0 has 9 to 6 highlighted in a slightly lighter color. This may be the default for this schedule control, but I will have development look into this.
I have moved this to the Known Issues & Updates section of this forum for development to look into.