When I enter a Math formula in my document in Writer, I press Alt-Shift-E, and the markup language window opens. But it’s out of focus. And I must grab the mouse and click on it to enter a formula. Quite inconvenient. Is it possible to assign a keyboard shortcut to switch to that window? Thanks. 
Hmm. I can start typing immediately. Same with 7.3.1.3, except then it is Ctrl+Alt+=. I frequently enter the markup in Writer, select it and then press shortcut which converts it without needing the Math window at all
What version and OS?
Version: 7.6.4.1 (X86_64) / LibreOffice Community
Build ID: e19e193f88cd6c0525a17fb7a176ed8e6a3e2aa1
CPU threads: 8; OS: Windows 10.0 Build 22631; UI render: Skia/Raster; VCL: win
Locale: en-NZ (en_NZ); UI: en-GB
Calc: CL threaded
Yes, for small pieces of math it’s handy to just enter markup in the text, select it and press the hotkey. But if it’s something bigger, a visual feedback is a must. UPD: yes, I can start typing in the main window, didn’t notice that at once. But still, a shortcut to switch windows would be useful.
Version: 24.2.2.2 (X86_64) / LibreOffice Community
Build ID: d56cc158d8a96260b836f100ef4b4ef25d6f1a01
CPU threads: 12; OS: Windows 10.0 Build 19045; UI render: Skia/Raster; VCL: win
Locale: ru-RU (en_US); UI: en-US
Calc: CL threaded
Just a note:
according to the LibreOffice Release Notes 24.2
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If that mode is disabled in
Options ⟶ LibreOffice Math ⟶ Settings, “Enable visual editing”,the formula editor (“the markup language window”) gets focus by default.
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Thank you, it works! Visual editing is also handy, but it inserts unwanted tildes, so I still have to switch to the command window and delete them. A possibility to assign a switcher hotkey would be the best solution, but, as I understand it, that’s not possible yet.