Display Timeframe on Chart
You can now display what timeframe a chart is set to at a variety of locations next to the price scale.
Right click on the chart and select edit chart properties
Select the Color/Grid tab
Select where you would like the Timeframe Display to be located by clicking the dropdown menu
The following screenshots will show you each of the locations for Top of Chart, Above Price, Below Price, and Bottom of Chart respectively, in each of these examples the chart is set to a different timeframe.