The game launches in a tiny window and I can't click on anything in the menu.

[Khajiit]

After googling it, I saw someone had a similar issue related to having a gamepad connected, but I use no controllers of any kind.

[Terminator855]

I have the same problem. You just need to restart the game.

[Khajiit]

Thanks, but if restarting the game had fixed my issue I wouldn't have made a thread about it.

[AI Sin || SinNoAria]

Do you have high DPI? (ie. 4K display or anything above 1080p).

If so, go to properties for the game and under Compatibility, set it to use System for High DPI Scaling Override. You will need to do this every time you want to open the game due to a bug/oversight (the game exe will reset after you start the game).

Also, set your in-game scaling to x5. It isn't perfect, but it can help. You may need to use fullscreen mode to see the settings.

You can change the in-game scaling by going to AppData/Local/NadiaWasHere and editing options.ini

Mine looks like this:
[Windows]
SleepMargin="1"
[options]
messages="1.000000"
difficulty="0.000000"
story="1.000000"
sfx="0.600000"
music="0.400000"
fullscreen="0.000000"
scale="0.000000"
stretch="1.000000"
scalefactor="10.000000" <- this is double the max size that you can set in-game. This seems to work for me, but I can't guarantee it to work for others. You might need to set it higher or lower.
gamespeed="3.000000"
pausebattle="1.000000"
controlerz="0.000000"

Yours should probably look like this:
[Windows]
SleepMargin="1"
[options]
messages="1.000000"
difficulty="0.000000"
story="1.000000"
sfx="0.600000"
music="0.400000"
fullscreen="0.000000"
scale="0.000000"
stretch="1.000000"
scalefactor="5.000000"
gamespeed="1.000000"
pausebattle="1.000000"
controlerz="0.000000"