The Preview has only a little to do with the appearance of the placed schedule.
Look at the Format tab for your schedule settings ... screenshot attached ... and change your options there. Note: when you specify text size (height), you also get to specify the height of the box the text is in, so that you can place space above and below the text.
Re: materials: I don't know what you mean. What do you want to see in your schedule for a material?
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB