You can use the dpi_scale setting for this in Sublime Merge and Sublime Text, but you'll have to restart after changing it. You'll need to edit the JSON setting

You can use the dpi_scale setting for this in Sublime Merge and Sublime Text, but you'll have to restart after changing it. You'll need to edit the JSON settings directly for this (via Preferences/Edit Settings), and then set dpi_scale to something reasonable, such as 1.25