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Hi 4lvar0Mart1nez,
As per your description, “the excel application freeze and doesn't complete the process” when you try to edit links and change the source in Excel for Mac OS.
Based on my test result in Excel version 16.54 it seems i can change source in edit link without any issue on Mac OS.
Since, as you did not mention your Office 365 Excel version in your description, first of all please make sure your Office apps are fully updated. The latest version of Office 365 for mac is 16.54. To Check version information, open any Office app, such as Excel, go to the Excel menu and choose About Excel.
If the version appears lower, then manually update Office apps, click Help > Check for Updates from any of the Office app to get the latest build.
For some reason if Office apps still didn’t update, then please download the Update packagefrom this article
Then, please make sure your file system is OK. starting by checking file system using Disk Utility. If there are file system problems, Disk Utility may be able to fix them.
How to repair a Mac disk with Disk Utility - Apple Support
Also, please try to operate a safe boot for Mac then the outcome. To operate the safe mode is to determine whether background programs are interfering with Office for Mac.
Disclaimer*: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.*
If above suggestion does not work for you, please feel free to confirm your Excel and MacOS version. Also, please confirm whether this issue happened to specific Excel file and even newly created Excel file as well.
I appreciate your understanding and stay safe!!
Best Regards
Waqas Muhammad