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The below settings can be changed :
Common : The time unit display on all the reports can be changed from here to either hours/days/default.
Epic Hierarchy :
Time Tracking progress : The time progress % of all the issues of your project can be based on either remaining estimate or original estimate calculation. The formulae to calculate the same is described in detail here.
Field Names: If the Issue type names have been changed in your Jira instance you need to specify them in the global settings. More details explained here.
Story Points: If you wish to include story points for issue types other than Story, select the option “Consider Issues other than Story” to “Yes”. More details explained here.
Common
: You can hide/show the columns on Epic Hierarchy or change the time Unit Display on Epic Hierarchy and TIS/TWA reports through this setting. More details explained here.
Field Names: If the Issue type names have been changed in your Jira instance you need to specify them in the global settings. More details explained here.
3. Time Reports : This setting is applicable to TIS and TWA reportYou can configure the working days
in a week and your working hours from this setting. Also the number of issues which can be exported to
Excel can be set from here. The max number allowed is 5000.