One tap marker are available for both charts and written instructions. You can use Setup (cropping a chart or adding text overlay) to add one tap markers to your project or use a kCDesign (setup is done for you). Note: one-tap markers are not available in QuickStart projects.
A one tap marker lets you move your row marker one row at a time using arrows on the right side of your screen. It can be regular or inverted, and once you have a one tap marker you can have lots of additional features such as row reminders, magic markers, smart counters and more. Here is what a one tap marker (inverted) looks like. The blue arrows to the right move the marker up and down. There are many settings for color and other options.