Global inventory overview:
This function is expanding the "search of items". The search already lists the exisiting items within the different storage options, so it scans the different inventorys anyway.
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Actually, the 'search for item' function does not access ALL the storage options available - it misses one... The Company Chest.

My addition to this thread is to allow the 'search for item' command to also search the contents in the Company Chest[CC] for said searched item. In my playtime in the FC, the CC is basically used for overflow of items being gathered/crafted - basically available to all who need them. I myself sometimes need some quick space in my bags for a specific raid or two to gather from. But in game time play I may forget the items I placed in the CC. The 'search for item' function can remind me what I placed in the CC. I, being a programming layman, don't see anything preventing this simple addition to work - but I will leave it to SE to make that decision if they may.