Hi,

Please go to Appearance → Customize → Custom CSS then add the following custom CSS code:

.pcheader-icon.penci-top-search {
    position: relative;
}
.show-search,
.sticky-wrapper:not(.is-sticky) #navigation .show-search,
#navigation.header-6 .penci-menuhbg-toggle, #navigation.header-6 .show-search {
    right: 30px;
    width: 270px;
    top: 45px;
    height: 60px !important;
    left: auto;
}
.sticky-wrapper:not(.is-sticky) .show-search form.pc-searchform input.search-input {
    height: 60px !important;
}
#navigation.header-6 .show-search form.pc-searchform input.search-input {
    height: 100%;
}
.show-search a.close-search {
    top: -45px;
    right: 15px;
}
#navigation.header-6 .show-search form.pc-searchform input.search-input {
    padding: 16px 35px;
}

Regards,
PenciDesign.