If you want to display a preview of text in a SharePoint List multiline column without showing the entire content, you can use a calculated column to achieve this. Here's a general approach:
Create a Calculated Column: Create a new calculated column in your SharePoint List.
Use a Formula to Extract Preview: In the formula for the calculated column, you can use a combination of functions to extract a portion of the text as a preview. For example, you can use the LEFT function to extract the first few characters of the text.Here's a sample formula:
=LEFT([YourMultilineColumn], 100)
This formula will extract the first 100 characters from your multiline column. You can adjust the number "100" to fit your desired preview length.
Set the Calculated Column to Display as Rich Text: Make sure to configure the calculated column to display as rich text if you want to maintain the rich text formatting.
Hide the Original Multiline Column: Optionally, you can hide the original multiline column from the list view if you don't want it to be displayed alongside the preview.
By using this approach, you can display a preview of the text in your multiline column while still maintaining the rich text formatting. Users can then click on the preview to view the full content if needed. Adjust the formula and preview length as necessary to fit your requirements.