wp-calypso/client/my-sites/plugins/sidebar/style.scss

.global-sidebar .sidebar--plugins {
	.sidebar__back-link {
		margin-bottom: 0;
		a {
			padding-inline: 0;
		}
		.sidebar__site-title {
			font-size: 18px;
			font-weight: 500;
		}
	}

	.sidebar__sub-heading {
		font-size: 13px;
		padding-inline: 20px;
		margin-top: 4px;
		margin-bottom: 13px;
		display: flex;
		align-items: center;
		gap: 4px;
	}
}