How to force user interface language at startup

Hi,
I installed Libre Office with English and Russian user interface. I use English but changed to Russian from English to show a friend. I got the Russian perfectly, but I don’t know Russian so as to revert to English! It could happen to anyone by mistake…
How can I revert to English, or the initially installed language?

Choose Tools - Options - Language Settings - Languages
Languages

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Alt+F12 calls the settings dialog.
In the tree control on the left side the 3rd node is “Language Settings”, the first sub-node is “Langauge Settings” and the first listbox on top selects the UI language.

And a picture (in English) but positions shown

In Russian UI:

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Hoping you didn’t change from “standard UI” to some fancy tabbed interface, the Tools menu is the third from right. Options is the last item in this menu.

Language Settings is the third option category (level-1 list at left of dialog). Languages is the first level-2 item under Language Settings.

The interface language menu is the topmost one. From there you can recover.

In case the OK button is also translated, it is the second from right.