Hello,
Regarding changing the Font Size for the Menu Items, you can go to Dashboard > Theme Settings > Typography > Advanced > there from the dropdown you can select specific Menu/Navigation-related selectors > and then you can define Font formatting there for those: https://snipboard.io/t0Ts1A.jpg
Further, you can read more about Advanced Typography here: https://xtemos.com/docs-topic/advanced-typography-settings/
Regarding the Icon size adjustment, you can try the following Custom CSS on your Site:
.wd-dropdown-menu.wd-design-aside.wd-style-with-bg .wd-sub-menu-wrapp>.wd-sub-menu>li>a .wd-nav-img {
max-height: 25px !important;
}
In this CSS, you can change or modify the value of max-height according to your choice.
Location to paste Custom CSS, go to Dashboard >> Theme Settings >> Custom CSS >> Global CSS section >> paste the CSS.
Best Regards