Thanks, David. I appreciate the response. Purr-Data's gui does not use .tcl; it runs on nw.js, so is written in HTML and CSS. I don't know if there is any way to send calls directly to the gui from a patch, but it is an interesting thought. I have looked for a zoom or other scaling setting in the preferences but am not seeing anything.

I am mainly asking this to see if anyone else has ideas before I go looking more deeply at the source code to see what I might be able to do with CSS--and if it can be done without having to compile from source. At the moment the binary packages come with CSS for different color themes, but there are no properties that address font size in those files either.

I have been searching the internet for hours looking for an answer to this question. I am running Purr-Data on Manjaro Linux and cannot find a way to persistently scale the GUI to my 4k monitor. I have tried changing the font size in the startup flags in Preferences and restarting, but nothing changes. The only way to make the canvas large enough to see is to hit Ctrl-+ several times every time I open or create a window.

I recall being able to scale up the old PD-extended years ago, but there are no options in Purr-Data's GUI settings that pertain to scale at all. Is there a css directive for font size that would work at least for the canvas and its objects? I can use the window decorations/application menus as they are, but I cannot even read the object names on the patches themselves.

And if nobody here knows the answer, where else might I ask? The proliferation of pure data support sites and forums over the last decade or so is.. good? but searching them all is wearing.