<h1>Remove unused css/js file from scss</h1>

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I make project and not publish yet using bootstrap/scss,and i just learn use scss with bootstrap5 and import all from scss.
That's make too much unused css file in my css and it's cause my web speed slower. I search on dev tools and found it but i think it's not possible to delete it one by one. Can someone suggest me with something with this problems?