risimati

How do I change the colour background of the primary Menu

THEME INFO

Theme Name : Blossom Coach
Theme Version : 1.5.1

WordPress Environment

Home URL : https://www.risimatihost.co.za/
Site URL : https://www.risimatihost.co.za
Login URL : https://www.risimatihost.co.za/wp-login.php
WP Version : 6.2.2
WP Multisite : -
WP Debug Mode : Disabled
PHP Memory Limit : 256M
WP Memory Limit : 40M
WP Language : en_US
WP Upload Directory : ?
Number of Category : 1
Number of Tag : 0

Server Environment

Server Info : Apache
PHP Version : 7.4.33
PHP Post Max Size : 128M
PHP Time Limit : 30
PHP Max Input Vars : 1000
SUHOSIN Installed : -
WP Remote Get : ?
PHP Image library installed : ?
PHP GD library installed : ?
PHP GD WebP supported : ?
PHP fileinfo library installed : ?
CURL Installed : ?

Active Plugins

All in One SEO : by All in One SEO Team - 4.4.1
Better Font Awesome : by Mickey Kay - 2.0.4
Blocks Animation: CSS Animations for Gutenberg Blocks : by ThemeIsle - 2.3.1
BlossomThemes Email Newsletter : by blossomthemes - 2.2.4
BlossomThemes Social Feed : by blossomthemes - 2.0.5
BlossomThemes Toolkit : by blossomthemes - 2.2.5
Custom Fonts : by Brainstorm Force - 2.0.2
Editor Plus : by Munir Kamal - 2.9.15
Font Awesome : by Font Awesome - 4.3.2
Fonts Plugin | Google Fonts Typography : by Fonts Plugin - 3.4.2
Formidable Forms : by Strategy11 Form Builder Team - 6.3.2
Forminator : by WPMU DEV - 1.24.6
Google Analytics for WordPress by MonsterInsights : by MonsterInsights - 8.17
Gutenberg : by Gutenberg Team - 16.1.2
Gutenverse : by Jegstudio - 1.8.6
Hello Dolly : by Matt Mullenweg - 1.7.2
Lottie Player - Block : by bPlugins LLC - 1.1.2
Max Mega Menu : by megamenu.com - 3.2.2
Pricing Table - Block : by bPlugins LLC - 1.0.6
Regenerate Thumbnails : by Alex Mills (Viper007Bond) - 3.1.5
Site Kit by Google : by Google - 1.104.0
Sliced Invoices : by Sliced Invoices - 3.9.1
Sliced Invoices & Formidable Forms : by Sliced Invoices - 1.0.2
Sliced Invoices Better URL's : by Sliced Invoices - 1.1.7
Smart Slider 3 : by Nextend - 3.5.1.17
Spectra : by Brainstorm Force - 2.6.9
SpeedyCache : by Softaculous Team - 1.0.7
Wheel of Life : by Kraft Plugins - 1.1.6

I could see images on the fronted but after saving there is nothing

What should I do to resolve this issue without uninstalling and reinstalling WordPress?

Yes, it is multisite.

I login as an Administrator. I am not 100% if it is multisite or not.