Check that your filter is set in such a way that it will show your colleagues' deals. The most simple way to do this is by selecting one of the default filters 'everyone' or '(your colleagues' name)'. Other custom filters may also give visibility to these deals. The filter dropdown is found at top right of the screen. Note that regular users may have visibility restricted to some records, which is set by the owner of the record or an admin user.
Next to the filter dropdown you will also find the Pipeline drop down. When you have multiple Pipelines on the account, make sure you have selected the right Pipeline here in combination with the right filter to find the deals.