The Tracking Scale slider determines how the line will be increased to the maximum width. If the width of the original line is greater than the slider value, the line will be increased using Tracking, increasing the distance between characters. If less, the characters themselves will be increased - Scale. There is also a switch that prescribes to always increase the line Scale if it has only one word.

Sets the minimum distance between lines. It is a percentage of the height of the highest line. At the minimum value, the distance between lines will be 0, at the maximum, the height of the highest line. There is a switch that enables/disables taking into account the size of the character below the baseline. Allows you to reduce the distance between lines, but line intersections are possible.

Enables the function of coloring lines with a gradient between two colors depending on the Scale value of this line. Lines that are not enlarged or with Tracking will be colored with the first color, lines with the maximum Scale will be colored in the second color.

In the FlyoutMenu there is a Clear SlabText item that resets some parameters to standard values. This helps if you want to edit or reformat the text. Clear SlabText sets Vertically and Horizontally Scale to 100%, Leading to Auto and Tracking to 0.