Hi, after the participant's or party's e-mail address, it appears an arrow > which causes mails to be grouped together within the same mail. How can I get rid of it to avoid the grouping? Thank you.

Whenever I open the single mail with the arrow > , it opens up as well all the past mails and sometimes mails which are not related with my topic. Please let me know how I can fix it avoiding the mail grouping. Many thanks in advance for your help. Kind rgds. FT