Although my settings are all in default and I haven't changed anything, I can no longer left click to pick up an item from my inventory into another interactive block (example; furnace). It has me drag the item while holding down left click and is very annoying since I didn't change anything on purpose.
Linked issues
duplicates
Comments

Turn off "Touchscreen Mode" in the Controls settings.

Thank you for your report!
We're tracking this issue in MC-5130, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
-- I am a bot. This action was performed automatically! Please report any issues on Discord or Reddit
you need to hold shift and left click to do this