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I use TPO + volume profile, volume profile extend point of control setting has been adjust to until future intersection but VOLUME PROFILE POC not extend in chart.

Can Sierrachart team fix this issue so I can set the fix window with for volume profile (not percentage in TPO setting) when using with TPO profile parallelly.

No. This is by design. You need to understand that TPO Profile Charts are special type of charts with special spacing requirements.

May I ask when the volume profile poc extension issue will be updated?

In Market Profile charts, "singles" refer to prices within profiles which only contain a single TPO/letter but which are surrounded (above and below) by prices with at least two TPOs. If you look at the market profile chart to the right (attached file), notice that singles were created in the N period, as those singles have double TPOs both above and below them. However, if you look at the P at extreme low of the profile, that is not considered a single because there are no prices below it which contain 2 or more TPOs.

Given this definition of "singles", when singles are taken out (when the current price moves to touch a single from a previous profile that had not currently been touched since it's creation), then it is theorized that price will commonly continue to the extreme price of the profile in which the single was created. Therefore, singles are labelled with the extreme price of the profile in which the single was created. That extreme price will be the high price of the profile if the single was made on the way down, and the low of the profile if single was made on the way up.

Notice in the chart to the right (attached file), that singles were created on the way down in the N period. While there are technically 5 single prices, the highest single made on the way down is the key single. If singles are created on the way up, the lowest key single is the one with the lowest price. And since this single is made on the way down, it is labelled with the high price of the profile (which happens to be 779.00). It is believed that if price returns to 760.00 during a subsequent profile ("takes out" the single), then price will continue to the high (779.00) of the profile in which it was created.

When using the Volume by Price study with the TPO Profile Chart study, all of the extension options for the Point of Control and Value Area are now supported with optional labels and they are all based upon volume profile calculations rather than TPOs.