Hello,
The issue with your formula is that the filter function needs a comparison to know how to filter. You're currently just providing WeekNoDropdown.Selected.Value as the filter condition, which isn't a complete comparison.
Assuming your 'TimeEntries' SharePoint list has a column that stores the week number (let's call it WeekNo
for this example), your formula should look like this:
Sum(Filter(TimeEntries, WeekNo = WeekNoDropDown.Selected.Value), 'Number of Hours')
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