キーボードの短縮を使用して拡張テキストの最初の文字を大文字にすることはできますか？

Yes, you can do this using the Simple Text shortcut.

Fastfox will automatically upper-case the expansion of a shortcut if you upper-case the
shortcut when you type it. Shortcuts are not case sensitive when you create them, but they are
case-sensitive when you are using them. FastFox will automatically decide whether to
upper-case the expansion based on how you type the shortcut. If you type the first character
of the shortcut in upper case, then FastFox will upper-case the first character in the expansion.
If you type ALL of the letters in uppercase, then FastFox will upper-case the entire expansion.

It is recommended that when you create your shortcut expansions that you use all lower case
letters. Here is an example:

Suppose you create a shortcut called "qbf" which will expand to "the quick brown fox jumps
over the lazy dog".

When you create it, type the shortcut in either upper or lower case. Either way, it will be
displayed in all upper case like this: QBF.

Type the expansion in all lower case: the quick brown fox jumps over the lazy dog

Then when you use the shortcut, if you type qbf, it will expand to: the quick brown fox jumps
over the lazy dog

If you type the shortcut this way: Qbf, then it will expand with the first letter capitalized like this:

The quick brown fox jumps over the lazy dog

But, if you type the shortcut in all caps this way: QBF, then it will expand to all caps like this:

THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG

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