Let’s talk about checkout UX: if a user is willing to pick up the item in store, why should there be a shipping form on the checkout?
Well, let’s see how we can hide this dynamically with a bit of PHP and JS!

PHP Snippet: Hide Shipping Fields When Local Pickup is Selected @ WooCommerce Checkout
/**
* @snippet Hide Shipping Fields If Local Pickup
* @how-to Get CustomizeWoo.com FREE
* @author Rodolfo Melogli
* @testedwith WooCommerce 7
* @donate $9 https://businessbloomer.com/bloomer-armada/
*/
add_action( 'woocommerce_after_checkout_form', 'bbloomer_disable_shipping_local_pickup' );
function bbloomer_disable_shipping_local_pickup( $available_gateways ) {
// Part 1: Hide shipping on checkout load
$chosen_methods = WC()->session->get( 'chosen_shipping_methods' );
$chosen_shipping = $chosen_methods[0];
if ( 0 === strpos( $chosen_shipping, 'local_pickup' ) ) {
wc_enqueue_js( "
$('#ship-to-different-address input').prop('checked', false).change().closest('h3').hide();
" );
}
// Part 2: Hide shipping on checkout shipping change
wc_enqueue_js( "
$('form.checkout').on('change','input[name^=\"shipping_method\"]',function() {
var val = $( this ).val();
if (val.match('^local_pickup')) {
$('#ship-to-different-address input').prop('checked', false).change().closest('h3').hide();
} else {
$('#ship-to-different-address input').prop('checked', true).change().closest('h3').show();
}
});
" );
}