Sorry to hear you are having trouble selecting text in XD. We would request you to please share the screenshot of your about XD info page. Could you please share a short video of your workflow for better understanding? Is it happening with all the files or with a specific file?
Sorry to hear you are having trouble while selecting text in XD. Would you mind telling us the XD version of your machine? Is it happening with all the text elements or with this specific text box? Is it a area text or a point text?