Hi,
I’ve been helping a graphic designer who was struggling with this “issue”.
I don’t think we can blame Adobe here or even Apple OS X, it is more a design weirdness Apple decided to make a screen with high density of pixel per inch, but still below HiDPI screen (well known as Retina).
I was unlucky to find any tricks fix InDesign UI, and the only way to get ID toolbars bigger would be to tune down your screen resolution, making everything just ugly, not an option when you’re *working* with ID.
So, here’s the holly grail, please be aware of some limitation:
Principle
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On non retina displays like Apple 27″ monitor, we can’t any HiDPI option. There’s one trick you might use to enable HiDPI. Open Terminal app and paste the following command, type your password:
sudo defaults write /Library/Preferences/com.apple.windowserver.plist DisplayResolutionEnabled -bool true
And log-out from your session. In the System Preference Display option, you’ll see an new resolution, half of your screen resolution. You might try it, but you’ll see everything twice bigger and honestly, it is not very usable.
We’re close, let’s know try to setup a non-2X retina configuration.
How
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You’ll need to get a shareware named SwitchResX. Maybe other can to the same, but I’ll describe how I did it with this one (€ 14 – still cheaper than buying a different screen – and most of you like you screen aren’t you?).
Once you installed the tool, you’ll need to pick your Thunderbolt Display, and select the + button and add a custom scaled resolution of 3840 x 2160.
This is a virtual resolution that will allow the system to create an acceptable HiDPI profile. Save, reboot and you should have a nice 1920 x 1080 HiDPI profile availabe either in the SwitchResX menu bar.
Here’s a screenshot (done with this new setting activated):
https://www.superlefty.net/images/hidpi_thunderbolt_display_27.png
Limitations
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SwitchResX is known to work up to Yosemite, if you already installed El Capitan, you might read the latest blog post of SwitchResX author. Kinda scary, probably worth postpone the upgrade, which is always a good thing with Adobe software.
Credits
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I didn’t find this all by myself, and certainly this MacRumors thread help me A LOT:
https://forums.macrumors.com/threads/updated-turtorial-non-2x-custom-hidpi-mode-on-macs-fixed-mouse-delay-problem.1568657/