Thanks for using Syncfusion products.
We would like to let you know that, we are having an API called “ShowHtmlSource” which is used to show or hide the “show html” icon in the RTE control. By default the value of ShowHtmlSource is “true”. In order to hide the icon we have to set the value as “false” as shown in the following code snippet.
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For your convenience we have prepared the sample based on your requirement, please download the sample from the following link location.
Please let us know if you have further concern.