[Theme Horse Support Team]

Hi there,

Please add below custom CSS code in Appearance > Customize > Additional CSS to increase the built-in font-size of the title and content.

.entry-title,
.comments-title,
.page-title {
	font-size: 28px;
}
body,
input,
textarea,
select,
blockquote footer,
.blockquote-footer,
blockquote cite,
.form-control,
input,
textarea,
select,
.site-description,
.search-block .form-control,
.wp-block-image,
.wp-block-image figcaption,
#bbpress-forums,
#bbpress-forums button,
#bbpress-forums ul.bbp-lead-topic,
#bbpress-forums ul.bbp-topics,
#bbpress-forums ul.bbp-forums,
#bbpress-forums ul.bbp-replies,
#bbpress-forums ul.bbp-search-results,
div.bbp-search-form input,
div.bbp-search-form button,
div.bbp-breadcrumb,
div.bbp-topic-tags {
	font-size: 15px;
}

Note: Increase the above digit value 28 for title and 15 for content section.

Thank you!