Add this sticky-logo CSS as custom CSS on the logo's advance tab. Add that CSS as custom CSS

Elementor Pro or Free Logo Shrink CSS

.elementor-sticky--effects .sticky-logo img {
	width: 320px!important;/*-- edit the pixels to change to desired shrinking size --*/
}

.sticky-logo img {
	transition: .5s all ease-in-out;
}

@media screen and (max-width: 767px) {
    .elementor-sticky--effects .sticky-logo img {
	width: 190px!important;/*-- edit the pixels to change to desired shrinking size for mobile --*/
}
}