I have created a Telerik Windows Form Application Project, and Then I added a RadGridView.
But it seems font changing does not affect columns and rows and so many others.
I should change the theme to ControlDefault to get the font affect.
This problem is also appearing on RadButtons. Where is the problem?



Please have in mind that for some controls (like RadLabel), it is enough to set the Font property, while for others (like RadGridView), you will need to introduce this setting in a formatting event, e.g. the CellFormatting/ViewCellFormatting events that RadGridView offers:
I would recommend you to have a look at the following KB article: https://docs.telerik.com/devtools/winforms/knowledge-base/change-the-font