Hi Babacar,
Selecting > Discover > Map Grid > (checkbox) Place labels in mask polygon outside map frame > seems to be the standard fixed size by default and cannot be changed automatically to scale larger outside the map . You can change the degree marker size manually in Layer Control > (Autogrid) > Checked for editable >
Double click on each degree marker one at a time and click the style icon and change the size of the font.
In the screenshot below, any change will placed inside the border. There does not to appear to be a better work around at this time.
![autogrid]()