No, slider questions do not support deselecting or clearing a response once a value has been selected. Respondents can adjust the slider to a different value, but they cannot leave the question unanswered after making a selection.

If you need respondents to be able to select and then unselect an answer, we recommend using a different question type (such as single-select or multi-select), which allows respondents to clear their selection.

As a workaround, you can add an “NA” option to the text slider. If respondents select the slider and later wish to deselect their response, they can choose the “NA” option instead. here is the screenshot for reference : https://app.screencast.com/PTESR0Q0k5tjF