The horizontal center option aligns the selected objects horizontally through the centre of the objects, and the vertical center option aligns the selected objects vertically through the centers of the objects. The leftmost object remains stationary, and the other objects are aligned relative to it. For example, the left option aligns the left edges of the selected objects with respect to the left edge of the leftmost object. When you align objects relative to each other by their edges, one of the objects remains stationary.

The Align Objects options in the right-hand panel let you precisely align multiple objects on a side - left, vertical center, right, top, horizontal centre, and bottom. Additional checks in the Preflight tool.Analyzing documents with the Preflight tool.Automating document analysis with droplets or preflight actions.Correcting problem areas with the Preflight tool.Viewing preflight results, objects, and resources.PDF/X-, PDF/A-, and PDF/E-compliant files.Playing video, audio, and multimedia formats in PDFs.Add audio, video, and interactive objects to PDFs.Edit document structure with the Content and Tags panels.Reading PDFs with reflow and accessibility features.Capture your signature on mobile and use it everywhere.Overview of security in Acrobat and PDFs.Securing PDFs with Adobe Experience Manager.Convert or export PDFs to other file formats.Hosting shared reviews on SharePoint or Office 365 sites.Working with component files in a PDF Portfolio.Add headers, footers, and Bates numbering to PDFs.Send PDF forms to recipients using email or an internal server.Troubleshoot scanner issues when scanning using Acrobat.Change the default font for adding text.Enhance document photos captured using a mobile camera.Rotate, move, delete, and renumber PDF pages.Asian, Cyrillic, and right-to-left text in PDFs.Grids, guides, and measurements in PDFs.Access Acrobat from desktop, mobile, web.

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