How to increase slider bar thickness (height, scale in Y)

3 Ways

  1. Modify Scale Y of Render Transform
    Increase Scale Y

    Then decrease Size Y of Thumb
    Then decrease Size Y of Slot

  2. Use ScaleBox
    Put Slider into ScaleBox

    Set Stretch to Scale to Fit Y
    Change Horizontal Alignment and Vertical Alignment
    Or you can set Stretch to User Specified and Increase User Specified Scale

  3. Hide background image (Thumb)

    Then add an customized image down of Slider