I have used the css below, but this also removes the quantity selector from the cart page.
How do I remove it only from the single product page but keep it on the cart page?

.woocommerce .quantity input[type=”number”], .woocommerce-page .quantity input[type=”number”] {
display:none; margin:0; padding 0;
}

Thank you!

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Try adding following CSS under Appearance > Customize > Custom > CSS:

.single-product .quantity input[type="number"] {
    display: none;
}

Hope it helps.

.woocommerce-page .single-product .quantity input[type=”number”] {
display: none;
}

You are most welcome!
It’s good to know that you’ve got it working.

If there’s anything else, we can help you with, please let us know.

All the best.

Please try following CSS:

.single-product .quantity input[type="number"] {
    display: none !important;
}

Let us know how it goes!