# Cannot select first opacity control point with mouse in transfer function editor because scalar-range handle blocks this option

**URL:** https://discourse.paraview.org/t/cannot-select-first-opacity-control-point-with-mouse-in-transfer-function-editor-because-scalar-range-handle-blocks-this-option/17312
**Category:** Development
**Created:** [November 17, 2025, 4:23am UTC](https://discourse.paraview.org/t/cannot-select-first-opacity-control-point-with-mouse-in-transfer-function-editor-because-scalar-range-handle-blocks-this-option/17312 "2025-11-17T04:23:54Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![swilliams\_KMT](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/b5e925/32.png) [@swilliams\_KMT](https://discourse.paraview.org/u/swilliams_KMT)
#### Post date: [November 17, 2025, 11:46pm UTC](https://discourse.paraview.org/t/cannot-select-first-opacity-control-point-with-mouse-in-transfer-function-editor-because-scalar-range-handle-blocks-this-option/17312/3 "2025-11-17T23:46:24Z")

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Hi Mathieu,

Thanks for your response. I don’t know if the issue was reported as a bug. Here is a post from 2020 where the user appears to have this selection issue.

> [@Color transfer function: Unable to delete multiple start/end points](https://discourse.paraview.org/t/color-transfer-function-unable-to-delete-multiple-start-end-points/3618):
>
> Hello, this is my first question on the forum. Forgive me if any rules were not followed. So, I added new points to the “Mapping Data” under “Color Map Editor”. I accidentally moved few of the points to the start (i.e. “Data: 1”). Now, I am unable to delete those extra points. (I can delete any points between start and end though) Any help will be appreciated. The following [image](https://discourse.paraview.org/uploads/short-url/hE99djkDxplFDf53VU1L1XzQYa7.png) shows what I am saying.

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