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

Thanks. That worked out perfectly!

There is indeed: I tried the same way as in Sublime Text and hurrah, it works.

Go to Preferences > Edit Settings, then add a new setting to the dict: `"dpi_scale": 2.0` (or whatever float value works for you)

I think you need to restart Sublime Merge then.