I have Free PBI Desktop v2.102.845 (64 bit free version Feb 2022) on Windows 10.
I would like a global default font size setting for all data in visuals, which would apply even to new PBIX files I make. This default font size would apply to grid data values in the grid viz or matrix viz, and legends of, for example, bar charts. I'd like another global default font size settings for column headers which would also apply to viz titles at the top of the viz. So if I make the default font size of the data and labels 12pt I'd make the default font size of the report title and column headers 14pt. The default font of 9 points is way too small for management and myself.
Unfortunately, this feature doesn’t support in Power BI currently. But you could vote for similar idea in Power BI Ideas, the product team will add new feature to improve Power BI according to the ideas submitted and voted there. Thanks in advance!