Setting LyX window font size

Paul A. Rubin parubin73 at
Wed Jan 27 19:35:56 UTC 2021

On 1/27/21 2:14 PM, Rich Shepard wrote:
> Running lyx- on Slackware-14.2/x86_64 with Xfce4-4.12.1. This 
> upgrade
> changed the font size on the window's menu, outline panel, and other
> non-text-body elements. They're now too small for me to comfortably read.
> See attached screenshot.
> Using Preferences -> Display I can set the document typeface, stroke, and
> size. But I cannot find where to change the window decorations. And using
> the Xfce4 Settings -> Display I can change the font size of other
> applications (e.g., GnuCash) but not the LyX window.
> I'm assuming that LyX uses Qt5 as the application framework in C++ and 
> I'm
> having difficulties finding how I can change the Qt5 font size in this
> application.
> All ideas on how to increase the font size on the frame surrounding the
> writing area are solicited.
> TIA,
> Rich
I'm not sure about Slackware, but on Mint (and Ubuntu) there is a 
utility named qt5ct (Qt5 Configuration Tool). On Mint (and presumably 
Ubuntu) it's available from the system menu by searching "qt5". If you 
install it and run it, you should get a simple GUI interface that lets 
you set all sorts of things. In the Fonts tab, click the ellipsis next 
to "General", leave the font selection alone but switch the font style 
to "Regular", pick a larger font size, click OK and then (back in the 
main window) Apply. You should see the font in the LyX menus change 
immediately (no restart required). There's a caveat: this will apply to 
all Qt5 apps (including the configuration tool), not just LyX.

If you want larger toolbar icons in LyX, that's handled from within LyX. 
Right click in any empty space on any toolbar and, at the bottom of the 
context menu, pick your preferred icon size.


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