Why do some Excel can not do anything to change the font

At the same table, with a cell of the first data can not do anything to change the format of the second data will be able to make any changes to a table, only individual cell that is the case, brush with the format can be changed, but would like to Why do they know that it, with what settings?
Thank you add the question:If you change the format of the entire unit can only change the format of the first to return to the original format.(Format:bold, italic, under the Line, fonts, colors, etc.).

Before an errant back:tools, policy-holders, policy-holders to withdraw.
But still can not change

issues are as follows
I tried, if the cells with red font, preservation, and then the cell number in the first transformation, words or letters when they automatically revert to the color red can not be changed, but if the cell as a whole can change the color, To know as soon resume, thank you!

you try to select the cell, the conditions for the election format ? format, and then delete points, to determine.and then want to change the color Can double-click the cell, and then choose the need to change the word, double-click on the font selected, select “Format Cells” in the pop-up dialog box can change the font of all the requirements.
If you need to change out of the whole, the election of the above “A, B, C ……” and then right-click in accordance with the above method (to choose the font) is required, or in the column format can be changed directly!