Last Update: 9/17/2020
When you have shown both the major tick labels and the minor tick labels for the axis, you might want to show them in different font size just like this:
To adjust the font size of major tick labels, you can
Double-click on the axis tick labels, go to the Format sub-tab under the Tick Labels tab of Axis dialog opened.
Please note, to change the font format, you can also click on the tick labels, and in the pop up mini toolbar, change the font and font size.
Once you have set the font size for the major tick labels, you can show the minor tick labels and set the font size to be a percentage of the major tick labels' font size.
To show the minor tick labels in different size, you can
Double-click on the axis, go to the Tick Labels tab and then Minor Tick Labels sub-tab, do the setting below:
\p50 means the font size of minor tick labels are 50% of the major tick labels' font size. You can refer to this page to find more format commands.
%d means show the value as a integer;
%.2g means show the decimal part and with 2 significant digit. You can refer to this page to find more %() format noations.