The there a way to bolden the horizontal lines between rows, or to make the green downtime events I am using here thinner or less tall then the row height?
you should be able to change some stuff here
or if you want all the borders you could ass this to your style sheet and add
YourClassName to the style of your component
.psc-YourClassName .ia_equipmentScheduleComponent__gridSpace__gridCell{
--containerBorder: solid 2px black
}