Replied 29 March 2021, 5:23 pm EST
As the code snippet suggested in the last response is a workaround so it is possible that it will not work properly in every situation like predecessor lines failing to reconnect to tasks.
The best way to change the row height is to set the Font of the GanttView and if you want all bar heights will be adapted accordingly to GanttView font then you can set the AdaptiveBarHeight property to true.
If you want to change the font of the row/Column header then you can set the Fixed Font as per your need.
c1GanttView1.Font = new Font("", 20);
c1GanttView1.AdaptiveBarHeight = true;
c1GanttView1.FixedFont = new Font("", 10);
If you want to change the text size on the grid side then you can set the font of the FlexGrid in the OwnerDrawCell event.