Which provider should be extended to remove buttons from the Text Editor?

To remove buttons from the Text Editor in Sitefinity, the EditorConfigProvider is the appropriate provider to extend. This provider is specifically designed to manage and configure the behavior and appearance of the text editing interfaces, including which buttons and features are available to users. By extending the EditorConfigProvider, you have a targeted way to customize the editor's functionality, allowing you to add or remove specific buttons according to your requirements.

The other providers are designed for different purposes. For example, the TextEditorProvider generally addresses broader text editor functionalities, while the ContentBlockProvider deals with content blocks used on pages, and the WidgetConfigProvider is focused on configuring various widget behaviors. These providers do not specifically target the configuration of the text editor's buttons and features, making them less suitable for the task of customizing the text editor interface directly.