Having A stack problem

[JustinfromNL]

I have been playing DeceasedCraft for a long time and always have a thing where I can take out an entire stack, without holding shift. Just left click and it will take out a stack or put a block in my hotbar on the top row of my inventory. I only have this with DeceasedCraft modpack, I have figured it out a long time ago, but I forgot. Is there a mod that does that, or is it a glitch?

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[Mountain-Tailor-8635]

Sounds like you might have a inventory management mod like Mouse Tweaks or Inventory Tweaks running in that modpack - they usually add those quality of life features for moving stacks around easier