Hi @RenéGonzalez ,
If the survey is published from Survey123 Connect, you can use a note question named generated_note_form_submit_text in the XLSForm file to change the submit button in the web app, please see the details in this help topic. Note: this starts to work in 3.11 version, if your survey is older than it you need to republish the survey by using a new version of Survey123 Connect (>=3.11).
@YasserMroue ,
If your survey is published from the web designer, please check if the submit button text is deleted accidentally or set a wrong color in the Appearance->Theme section.
If the survey is published from Survey123 Connect, please refer to the note above and check if it is overwritten in the XLSForm file.
Thanks,
Zhifang