Configuring preferences and options in Outlook.com
@Arun B said
A recent update to Outlook on the web changed how conversation threads are displayed. Previously, each email in a thread appeared as an individual, clickable card/tab
Not sure I follow. For me using Outlook Web https://outlook.cloud.microsoft/ with a outlook.com account, Conversations seem to be the same as they always were. e.g.
Now, older parts of the thread are merged into a single continuous body of text.
That sounds kind of like Classic Outlook "Conversation Cleanup". You also running Classic Outlook?
https://support.microsoft.com/en-us/outlook/use-conversation-clean-up-to-delete-redundant-messages-in-outlook