I have installed Indesign CC2017 English/Arabic - the F1 help / About Indesign is in Arabic. How can I change the text to be in English?
About InDesign will always show the same English flash screen, perhaps you mean the online Help portal!
To change the language of Help portal permanently, you can scroll down the Help web page, you should see World map at the bottom right of the page, change your location to another English speaking country perhaps.
To change the language on the Help page temporarily, you simply change "ar" which stands for Arabic to "en" as follows…