@Harshitha Veeramalla Thank you for your answer. Yes I saw it this Q&A, I saw also that in ChatComposite component there is an option to enable or disable the rich text editor. This option locally is working. But does not works when I am trying to deploy the project on Azure for example.
Here is my code:
<ChatComposite
adapter={adapter}
fluentTheme={currentTheme.theme}
options={{
autoFocus: 'sendBoxTextField',
topic: false,
richTextEditor: true,
participantPane: false,
attachmentOptions: {
uploadOptions: uploadOptions,
downloadOptions: downloadOptions
}