# Question about scalar parameter slider 

**URL:** <https://forums.unrealengine.com/t/question-about-scalar-parameter-slider/2853476>\
**Category:** Rendering\
**Tags:** unreal-engine, editor, question, Blueprint\
**Created:** [November 10, 2026, 5:53pm UTC](https://forums.unrealengine.com/t/question-about-scalar-parameter-slider/2853476 "2026-11-10T17:53:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![STARLEE](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@STARLEE](https://forums.unrealengine.com/u/STARLEE)\
**Post date:** [November 10, 2026, 5:53pm UTC](https://forums.unrealengine.com/t/question-about-scalar-parameter-slider/2853476/1 "2026-11-10T17:53:27Z")

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Im new to Unreal Engine and following a master material tutorial I found on YouTube. When I move a slider between 0 and 1 using the parameters, the material preview in the top-left corner only updates when I release the mouse button. The same thing happens with the maps I’ve added to the Blueprint: they briefly disappear and reappear when I release the mouse button. How can I fix this?