There is currently no possibility to select multiple objects in LibreOffice writer and to transform them.
It would be desirable to be able to select several objects while holding the Ctrl-Button and Mousclick.
In the event that these objects are of the same type, it should be possible to pass these properties on to all selected objects via the empty input mask.
Should the selected objects
(incl. text-blocks) are not of the same type, it should logically only be possible to delete.
Please edit your question to give more details about the “objects”. You mention “text block”. Do you mean text boxes? What are you using them for? If they play a “central” role in your document, you’re wrong and there are other much better integrated solutions. If they are there just like “images”, well, that’s acceptable but if there are several related to each other, this should be designed in Draw.
Describe what you want to do. I feel you’re using the wrong tool. But this can be confirmed only with a more extensive description.
Don’t use an answer: it is reserved for solutions on this site.
If you are talking about shapes then you can use Clone Formatting (paint brush). Click on the object whose properties you want to replicate, double-click on Clone Formatting, hold down Ctrl and click on each shape for which you want to change the appearance.
With the mouse drag-select the objects, right-click and select Position and Size, rotate (as a block), or alter size, e.g. 10 cm to 20 cm and keep ratio.
Better to do as ajlittoz says and use Draw, then just insert final image
ps: sorry Buddys this feature 
Was an exclusionary cremum why we don’t use LibreOffice next year, the 5000 dollars go to Office365. Maybe we’ll donate next to the community
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This is no solution to your problem. You were told to edit your question.
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I don’t understand a damn of it.