JPG preview setting from normal to large change 100% zoom in Dev module! (?)

Question

I have subscribed an Adobe Creative Cloud for Photography (PS+LRC)

Inside Lightroom Classic, in the Settings I had the JPEG Preview as Medium Size, that is the standard setting.

I have loaded a new set of photos from a new 100MP Fuji camera, they are over 11000 pixels on the longest side, and tried to edit them in the Development module, but when zooming to 100% the actual zoom was very little maybe around 20%! This never happened with my older photos taken with a 24MP camera!

I also have a free version of Capture One and there I realized that the 100% zoom on the new photos was way greater.

I looked for info for my LRC problem and found nothing until I had the idea to change the JPEG Preview setting to Full size and uploaded a new photo, and ta-dah! the zoom to 100% is much grteater than before, it is a real 100% zoom!

For more understanding and details I uploaded here a short video to see the difference of the 100% zoom you get between a 100MP photo uploaded with Medium Size preview and one loaded with Full size preview.

Is it normal??

What can I do now to be able to have a real 100% zoom on the photos I previously uploaded with the Medium Size preview setting??

Thanks

I have a monitor which reaches 1280 pixels. Working on Win 10.

Paolo24078271am0c · Answer

Sorry I add here my system info:

Lightroom Classic version: 11.3 [ 202204051513-7a25c809 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10 - Home Premium Edition
Version: 10.0.19043
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 3,4GHz
SqLite Version: 3.36.0
Built-in memory: 16320,1 MB
Real memory available to Lightroom: 16320,1 MB
Real memory used by Lightroom: 3385,4 MB (20,7%)
Virtual memory used by Lightroom: 6364,2 MB
GDI objects count: 811
USER objects count: 2754
Process handles count: 2023
Memory cache size: 5,5MB
Internal Camera Raw version: 14.3 [ 1072 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 950MB / 8160MB (11%)
Camera Raw real memory: 1112MB / 16320MB (6%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 1920x1200
Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: Yes, Keyboard: No

Graphics Processor Info:
DirectX: NVIDIA GeForce GTX 1060 3GB (27.21.14.5671)

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: D:\Lightroom Catalogs\Foto Vintage\Foto Vintage-v11.lrcat
Settings Folder: C:\Users\user_1\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) AdobeStock
2) Facebook
3) Flickr
4) Nikon Tether Plugin

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