Hi,
Kayece here, An Independent advisor and a user just like you. I will be happy to assist you today.
From what I understand, you wanted to display picture thumbnails on your Windows 10 instead of icons. Correct me if I am wrong. Try to check and update your Advance System properties.
*On your taskbar search box, input Advanced system settings> Click View advanced system settings > Under Advanced tab > Performance > Click Settings > Check the Show thumbnails instead of icons > Click Apply and Ok > Restart your device.
Source: https://answers.microsoft.com/en-us/windows/for...
If none works, please visit the source link and you will see the suggested steps if the above method didn't work.
If you need more help, let me know.
Stay Safe!