Hi,

If you want to make top-bar icons white, you can just enable light color-scheme in top-bar options (https://prnt.sc/1v9io43). If you want use other color, try to add the following code snippet to the Custom CSS area in Theme Settings.

.xts-site-wrapper .xts-top-bar .xts-header-el .xts-header-el-icon:before {
   color: red;
}

Try to add the following code snippet to the Custom CSS area in Theme Settings to change top-bar icons size.

.xts-site-wrapper .xts-top-bar .xts-header-el .xts-header-el-icon:before {
		font-size: 20px;
}

Kind Regards