Different Ways to Change active WordPress theme

Here are a few ways you can change the active theme in WordPress:

Using WP Dashboard

Using the WordPress Administration Screens: You can change the active theme by going to the “Appearance” -> “Themes” page in the WordPress Administration Screens and selecting a new theme.

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Using functions.php or a custom plugin

Using the wp_set_theme function: You can use the wp_set_theme function to change the active theme. For example:

wp_set_theme('twentytwenty');  // change the active theme to the default theme (twentytwenty)

or in a form of a plugin:

<?php
/*
Plugin Name: Change Theme to Default Plugin
Description: This plugin changes the active theme to the default theme.
Version: 1.0
Author: Stefan Pejcic
*/

function change_theme_to_default_plugin_activate() {
  switch_theme('twentytwenty');  // change the active theme to the default theme (twentytwenty)
}
register_activation_hook(__FILE__, 'change_theme_to_default_plugin_activate');

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From the PHPMyAdmin

Modifying the template and stylesheet options: You can change the active theme by modifying the template and stylesheet options in the wp_options table in the WordPress database. For example:

update_option('template', 'twentytwenty');
update_option('stylesheet', 'twentytwenty');

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From MySQL

To change the active theme using an SQL command, you can use the UPDATE statement to modify the template and stylesheet options in the wp_options table.

Here is the SQL command to change the active theme to the default theme (twentytwenty):

UPDATE wp_options SET option_value='twentytwenty' WHERE option_name='template' OR option_name='stylesheet';

This command will update the option_value of the template and stylesheet options to ‘twentytwenty’, which will change the active theme to the default theme.

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Using WP-CLI

To change the active theme using WP-CLI, you can use the theme activate command.

For example, to change the active theme to the default theme (twentytwenty), you can use the following command:

wp theme activate twentytwenty

This command will activate the twentytwenty theme.

You can also use the --network flag to activate a theme for all sites in a multisite network. For example:

wp theme activate twentytwenty --network

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I hope this helps! Let me know if you have any other questions.