Personally, I have always used the ancient Windows OS feature charmap.exe for accessing special characters – I have it saved in my Notepad++ Run menu with a keyboard shortcut to make it easy to access from Notepad++ … once it pops up, I choose “Group By: Unicode Subrange” and pick the category (“subrange”) of characters to choose from.
But I just tried @guy038’s Win+; (and I think his “or” was meant to be Win+. instead of a second semicolon-based shortcut, because that’s the shortcut that the Emojis and Symbols panel told me to use when I first invoked it by Win+;… but now it’s stopped showing me that) – I might have to try to remember this one, because it might be faster (and supported longer into the future) than the old charmap.